{"id":2476,"date":"2024-05-03T20:25:12","date_gmt":"2024-05-03T20:25:12","guid":{"rendered":"https:\/\/labs.cs.queensu.ca\/perklab\/members\/sean-xia\/"},"modified":"2024-05-03T20:25:12","modified_gmt":"2024-05-03T20:25:12","slug":"sean-xia","status":"publish","type":"qsc_member","link":"https:\/\/labs.cs.queensu.ca\/perklab\/members\/sean-xia\/","title":{"rendered":"Sean Xia"},"content":{"rendered":"<div class=\"wp-block-columns is-layout-flex wp-block-columns-is-layout-flex qsc-member-single-core-info-container\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow qsc-member-single-photo-column\">\n\t\t<img decoding=\"async\" src=\"https:\/\/labs.cs.queensu.ca\/perklab\/wp-content\/plugins\/qsc-members\/\/images\/missing-image-placeholder.png\" class=\"qsc-member-single-photo\"\/>\n\t<\/div>\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow qsc-member-single-info-column\">\n<div class=\"qsc-member-name\">\n<h1>Sean Xia<\/h1>\n<\/div>\n<div class=\"qsc-member-position\">Medical Student<\/div>\n<div class=\"qsc-member-department\"><\/div>\n<div class=\"qsc-member-organization\">Queen&#8217;s University<\/div>\n<div class=\"qsc-member-date-range\">Member from <em>2017<\/em> to <em>present<\/em><\/div>\n<div class=\"qsc-member-contact\">\n<div class=\"qsc-member-socials\">\n\t\t\t<\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/div>\n<div class=\"qsc-member-bio\">\n<div class=\"teachpress_pub_list\"><form name=\"tppublistform\" method=\"get\"><a name=\"tppubs\" id=\"tppubs\"><\/a><\/form><div class=\"teachpress_publication_list\"><div class=\"tp_publication tp_publication_article\"><div class=\"tp_pub_info\"><p class=\"tp_pub_author\"> Holden, Matthew S.;  Xia, Sean;  Lia, Hillary;  Keri, Zsuzsanna;  Bell, Colin;  Patterson, Lindsey;  Ungi, Tamas;  Fichtinger, Gabor<\/p><p class=\"tp_pub_title\"><a class=\"tp_title_link\" href=\"https:\/\/dx.doi.org\/10.1007\/s11548-019-01977-3\" title=\"Machine learning methods for automated technical skills assessment with instructional feedback in ultrasound-guided interventions\" target=\"blank\">Machine learning methods for automated technical skills assessment with instructional feedback in ultrasound-guided interventions<\/a> <span class=\"tp_pub_type tp_  article\">Journal Article<\/span> <\/p><p class=\"tp_pub_additional\"><span class=\"tp_pub_additional_in\">In: <\/span><span class=\"tp_pub_additional_journal\">Int J CARS, <\/span><span class=\"tp_pub_additional_volume\">vol. 14, <\/span><span class=\"tp_pub_additional_number\">no. 11, <\/span><span class=\"tp_pub_additional_pages\">pp. 1993\u20132003, <\/span><span class=\"tp_pub_additional_year\">2019<\/span>, <span class=\"tp_pub_additional_issn\">ISSN: 1861-6429<\/span>.<\/p><p class=\"tp_pub_menu\"><span class=\"tp_resource_link\"><a id=\"tp_links_sh_6\" class=\"tp_show\" onclick=\"teachpress_pub_showhide('6','tp_links')\" title=\"Show links and resources\" style=\"cursor:pointer;\">Links<\/a><\/span> | <span class=\"tp_bibtex_link\"><a id=\"tp_bibtex_sh_6\" class=\"tp_show\" onclick=\"teachpress_pub_showhide('6','tp_bibtex')\" title=\"Show BibTeX entry\" style=\"cursor:pointer;\">BibTeX<\/a><\/span><\/p><div class=\"tp_bibtex\" id=\"tp_bibtex_6\" style=\"display:none;\"><div class=\"tp_bibtex_entry\"><pre>@article{Holden2019,<br \/>\r\ntitle = {Machine learning methods for automated technical skills assessment with instructional feedback in ultrasound-guided interventions},<br \/>\r\nauthor = {Matthew S. Holden and Sean Xia and Hillary Lia and Zsuzsanna Keri and Colin Bell and Lindsey Patterson and Tamas Ungi and Gabor Fichtinger},<br \/>\r\nurl = {https:\/\/labs.cs.queensu.ca\/perklab\/wp-content\/uploads\/sites\/3\/2024\/01\/Holden2019a-manuscript-2.pdf<br \/>\r\nhttps:\/\/labs.cs.queensu.ca\/perklab\/wp-content\/uploads\/sites\/3\/2024\/01\/Holden2019a-2.pdf},<br \/>\r\ndoi = {10.1007\/s11548-019-01977-3},<br \/>\r\nissn = {1861-6429},<br \/>\r\nyear  = {2019},<br \/>\r\ndate = {2019-01-01},<br \/>\r\nurldate = {2019-01-01},<br \/>\r\njournal = {Int J CARS},<br \/>\r\nvolume = {14},<br \/>\r\nnumber = {11},<br \/>\r\npages = {1993--2003},<br \/>\r\npublisher = {Springer Science and Business Media LLC},<br \/>\r\nkeywords = {},<br \/>\r\npubstate = {published},<br \/>\r\ntppubtype = {article}<br \/>\r\n}<br \/>\r\n<\/pre><\/div><p class=\"tp_close_menu\"><a class=\"tp_close\" onclick=\"teachpress_pub_showhide('6','tp_bibtex')\">Close<\/a><\/p><\/div><div class=\"tp_links\" id=\"tp_links_6\" style=\"display:none;\"><div class=\"tp_links_entry\"><ul class=\"tp_pub_list\"><li><i class=\"fas fa-file-pdf\"><\/i><a class=\"tp_pub_list\" href=\"https:\/\/labs.cs.queensu.ca\/perklab\/wp-content\/uploads\/sites\/3\/2024\/01\/Holden2019a-manuscript-2.pdf\" title=\"https:\/\/labs.cs.queensu.ca\/perklab\/wp-content\/uploads\/sites\/3\/2024\/01\/Holden2019[...]\" target=\"_blank\">https:\/\/labs.cs.queensu.ca\/perklab\/wp-content\/uploads\/sites\/3\/2024\/01\/Holden2019[...]<\/a><\/li><li><i class=\"fas fa-file-pdf\"><\/i><a class=\"tp_pub_list\" href=\"https:\/\/labs.cs.queensu.ca\/perklab\/wp-content\/uploads\/sites\/3\/2024\/01\/Holden2019a-2.pdf\" title=\"https:\/\/labs.cs.queensu.ca\/perklab\/wp-content\/uploads\/sites\/3\/2024\/01\/Holden2019[...]\" target=\"_blank\">https:\/\/labs.cs.queensu.ca\/perklab\/wp-content\/uploads\/sites\/3\/2024\/01\/Holden2019[...]<\/a><\/li><li><i class=\"ai ai-doi\"><\/i><a class=\"tp_pub_list\" href=\"https:\/\/dx.doi.org\/10.1007\/s11548-019-01977-3\" title=\"Follow DOI:10.1007\/s11548-019-01977-3\" target=\"_blank\">doi:10.1007\/s11548-019-01977-3<\/a><\/li><\/ul><\/div><p class=\"tp_close_menu\"><a class=\"tp_close\" onclick=\"teachpress_pub_showhide('6','tp_links')\">Close<\/a><\/p><\/div><\/div><\/div><div class=\"tp_publication tp_publication_conference\"><div class=\"tp_pub_info\"><p class=\"tp_pub_author\"> Holden, M.;  Lia, H.;  Xia, Sean;  Keri, Zsuzsanna;  Ungi, Tamas;  Fichtinger, Gabor<\/p><p class=\"tp_pub_title\"><a class=\"tp_title_link\" href=\"https:\/\/labs.cs.queensu.ca\/perklab\/wp-content\/uploads\/sites\/3\/2024\/02\/Holden2018b.pdf\" title=\"https:\/\/labs.cs.queensu.ca\/perklab\/wp-content\/uploads\/sites\/3\/2024\/02\/Holden2018b.pdf\" target=\"blank\">Configurable Overall Skill Assessment in Ultrasound-Guided Needle Insertion<\/a> <span class=\"tp_pub_type tp_  conference\">Conference<\/span> <\/p><p class=\"tp_pub_additional\"><span class=\"tp_pub_additional_booktitle\">16th Annual Imaging Network Ontario Symposium (ImNO), <\/span><span class=\"tp_pub_additional_address\">Toronto, Canada, <\/span><span class=\"tp_pub_additional_year\">2018<\/span>.<\/p><p class=\"tp_pub_menu\"><span class=\"tp_resource_link\"><a id=\"tp_links_sh_93\" class=\"tp_show\" onclick=\"teachpress_pub_showhide('93','tp_links')\" title=\"Show links and resources\" style=\"cursor:pointer;\">Links<\/a><\/span> | <span class=\"tp_bibtex_link\"><a id=\"tp_bibtex_sh_93\" class=\"tp_show\" onclick=\"teachpress_pub_showhide('93','tp_bibtex')\" title=\"Show BibTeX entry\" style=\"cursor:pointer;\">BibTeX<\/a><\/span><\/p><div class=\"tp_bibtex\" id=\"tp_bibtex_93\" style=\"display:none;\"><div class=\"tp_bibtex_entry\"><pre>@conference{Holden2018b,<br \/>\r\ntitle = {Configurable Overall Skill Assessment in Ultrasound-Guided Needle Insertion},<br \/>\r\nauthor = {M. Holden and H. Lia and Sean Xia and Zsuzsanna Keri and Tamas Ungi and Gabor Fichtinger},<br \/>\r\nurl = {https:\/\/labs.cs.queensu.ca\/perklab\/wp-content\/uploads\/sites\/3\/2024\/02\/Holden2018b.pdf},<br \/>\r\nyear  = {2018},<br \/>\r\ndate = {2018-03-01},<br \/>\r\nurldate = {2018-03-01},<br \/>\r\nbooktitle = {16th Annual Imaging Network Ontario Symposium (ImNO)},<br \/>\r\naddress = {Toronto, Canada},<br \/>\r\nkeywords = {},<br \/>\r\npubstate = {published},<br \/>\r\ntppubtype = {conference}<br \/>\r\n}<br \/>\r\n<\/pre><\/div><p class=\"tp_close_menu\"><a class=\"tp_close\" onclick=\"teachpress_pub_showhide('93','tp_bibtex')\">Close<\/a><\/p><\/div><div class=\"tp_links\" id=\"tp_links_93\" style=\"display:none;\"><div class=\"tp_links_entry\"><ul class=\"tp_pub_list\"><li><i class=\"fas fa-file-pdf\"><\/i><a class=\"tp_pub_list\" href=\"https:\/\/labs.cs.queensu.ca\/perklab\/wp-content\/uploads\/sites\/3\/2024\/02\/Holden2018b.pdf\" title=\"https:\/\/labs.cs.queensu.ca\/perklab\/wp-content\/uploads\/sites\/3\/2024\/02\/Holden2018[...]\" target=\"_blank\">https:\/\/labs.cs.queensu.ca\/perklab\/wp-content\/uploads\/sites\/3\/2024\/02\/Holden2018[...]<\/a><\/li><\/ul><\/div><p class=\"tp_close_menu\"><a class=\"tp_close\" onclick=\"teachpress_pub_showhide('93','tp_links')\">Close<\/a><\/p><\/div><\/div><\/div><div class=\"tp_publication tp_publication_article\"><div class=\"tp_pub_info\"><p class=\"tp_pub_author\"> Xia, Sean;  Keri, Zsuzsanna;  Holden, Matthew S;  Hisey, Rebecca;  Lia, Hillary;  Ungi, Tamas;  Mitchell, Christopher H;  Fichtinger, Gabor<\/p><p class=\"tp_pub_title\"><a class=\"tp_title_link\" href=\"https:\/\/www.spiedigitallibrary.org\/conference-proceedings-of-spie\/10576\/1057625\/A-learning-curve-analysis-of-ultrasound-guided-in-plane-and\/10.1117\/12.2293789.short\" title=\"https:\/\/www.spiedigitallibrary.org\/conference-proceedings-of-spie\/10576\/1057625\/A-learning-curve-analysis-of-ultrasound-guided-in-plane-and\/10.1117\/12.2293789.short\" target=\"blank\">A learning curve analysis of ultrasound-guided in-plane and out-of-plane vascular access training with Perk Tutor<\/a> <span class=\"tp_pub_type tp_  article\">Journal Article<\/span> <\/p><p class=\"tp_pub_additional\"><span class=\"tp_pub_additional_in\">In: <\/span><span class=\"tp_pub_additional_volume\">vol. 10576, <\/span><span class=\"tp_pub_additional_pages\">pp. 512-519, <\/span><span class=\"tp_pub_additional_year\">2018<\/span>.<\/p><p class=\"tp_pub_menu\"><span class=\"tp_abstract_link\"><a id=\"tp_abstract_sh_871\" class=\"tp_show\" onclick=\"teachpress_pub_showhide('871','tp_abstract')\" title=\"Show abstract\" style=\"cursor:pointer;\">Abstract<\/a><\/span> | <span class=\"tp_resource_link\"><a id=\"tp_links_sh_871\" class=\"tp_show\" onclick=\"teachpress_pub_showhide('871','tp_links')\" title=\"Show links and resources\" style=\"cursor:pointer;\">Links<\/a><\/span> | <span class=\"tp_bibtex_link\"><a id=\"tp_bibtex_sh_871\" class=\"tp_show\" onclick=\"teachpress_pub_showhide('871','tp_bibtex')\" title=\"Show BibTeX entry\" style=\"cursor:pointer;\">BibTeX<\/a><\/span><\/p><div class=\"tp_bibtex\" id=\"tp_bibtex_871\" style=\"display:none;\"><div class=\"tp_bibtex_entry\"><pre>@article{fichtinger2018i,<br \/>\r\ntitle = {A learning curve analysis of ultrasound-guided in-plane and out-of-plane vascular access training with Perk Tutor},<br \/>\r\nauthor = {Sean Xia and Zsuzsanna Keri and Matthew S Holden and Rebecca Hisey and Hillary Lia and Tamas Ungi and Christopher H Mitchell and Gabor Fichtinger},<br \/>\r\nurl = {https:\/\/www.spiedigitallibrary.org\/conference-proceedings-of-spie\/10576\/1057625\/A-learning-curve-analysis-of-ultrasound-guided-in-plane-and\/10.1117\/12.2293789.short},<br \/>\r\nyear  = {2018},<br \/>\r\ndate = {2018-01-01},<br \/>\r\nvolume = {10576},<br \/>\r\npages = {512-519},<br \/>\r\npublisher = {SPIE},<br \/>\r\nabstract = {PURPOSE <br \/>\r\nUnder ultrasound guidance, procedures that have been traditionally performed using landmark approaches have become safer and more efficient. However, inexperienced trainees struggle with coordinating probe handling and needle insertion. We aimed to establish learning curves to identify the rate of acquisition of in-plane and out-of-plane vascular access skill in novice medical trainees. <br \/>\r\nMETHODS <br \/>\r\nThirty-eight novice participants were randomly assigned to perform either in-plane or out-of-plane insertions. Participants underwent baseline testing, four practice insertions (with 3D visualization assistance), and final testing; performance metrics were computed for all procedures. Five expert participants performed insertions in both approaches to establish expert performance metric benchmarks. <br \/>\r\nRESULTS In-plane novices (n=19) demonstrated significant final reductions in needle path inefficiency (45.8 \u2026},<br \/>\r\nkeywords = {},<br \/>\r\npubstate = {published},<br \/>\r\ntppubtype = {article}<br \/>\r\n}<br \/>\r\n<\/pre><\/div><p class=\"tp_close_menu\"><a class=\"tp_close\" onclick=\"teachpress_pub_showhide('871','tp_bibtex')\">Close<\/a><\/p><\/div><div class=\"tp_abstract\" id=\"tp_abstract_871\" style=\"display:none;\"><div class=\"tp_abstract_entry\">PURPOSE <br \/>\r\nUnder ultrasound guidance, procedures that have been traditionally performed using landmark approaches have become safer and more efficient. However, inexperienced trainees struggle with coordinating probe handling and needle insertion. We aimed to establish learning curves to identify the rate of acquisition of in-plane and out-of-plane vascular access skill in novice medical trainees. <br \/>\r\nMETHODS <br \/>\r\nThirty-eight novice participants were randomly assigned to perform either in-plane or out-of-plane insertions. Participants underwent baseline testing, four practice insertions (with 3D visualization assistance), and final testing; performance metrics were computed for all procedures. Five expert participants performed insertions in both approaches to establish expert performance metric benchmarks. <br \/>\r\nRESULTS In-plane novices (n=19) demonstrated significant final reductions in needle path inefficiency (45.8 \u2026<\/div><p class=\"tp_close_menu\"><a class=\"tp_close\" onclick=\"teachpress_pub_showhide('871','tp_abstract')\">Close<\/a><\/p><\/div><div class=\"tp_links\" id=\"tp_links_871\" style=\"display:none;\"><div class=\"tp_links_entry\"><ul class=\"tp_pub_list\"><li><i class=\"fas fa-globe\"><\/i><a class=\"tp_pub_list\" href=\"https:\/\/www.spiedigitallibrary.org\/conference-proceedings-of-spie\/10576\/1057625\/A-learning-curve-analysis-of-ultrasound-guided-in-plane-and\/10.1117\/12.2293789.short\" title=\"https:\/\/www.spiedigitallibrary.org\/conference-proceedings-of-spie\/10576\/1057625\/[...]\" target=\"_blank\">https:\/\/www.spiedigitallibrary.org\/conference-proceedings-of-spie\/10576\/1057625\/[...]<\/a><\/li><\/ul><\/div><p class=\"tp_close_menu\"><a class=\"tp_close\" onclick=\"teachpress_pub_showhide('871','tp_links')\">Close<\/a><\/p><\/div><\/div><\/div><div class=\"tp_publication tp_publication_article\"><div class=\"tp_pub_info\"><p class=\"tp_pub_author\"> Holden, Matthew S;  Lia, Hillary;  Xia, Sean;  Keri, Zsuzsanna;  Ungi, Tamas;  Fichtinger, Gabor<\/p><p class=\"tp_pub_title\"><a class=\"tp_title_link\" href=\"http:\/\/perk.cs.queensu.ca\/sites\/perkd7.cs.queensu.ca\/files\/Holden2018b.pdf\" title=\"http:\/\/perk.cs.queensu.ca\/sites\/perkd7.cs.queensu.ca\/files\/Holden2018b.pdf\" target=\"blank\">Configurable overall skill assessment in ultrasound-guided needle insertion<\/a> <span class=\"tp_pub_type tp_  article\">Journal Article<\/span> <\/p><p class=\"tp_pub_additional\"><span class=\"tp_pub_additional_in\">In: <\/span><span class=\"tp_pub_additional_journal\">16th annual imaging network Ontario symposium (ImNO), <\/span><span class=\"tp_pub_additional_year\">2018<\/span>.<\/p><p class=\"tp_pub_menu\"><span class=\"tp_abstract_link\"><a id=\"tp_abstract_sh_899\" class=\"tp_show\" onclick=\"teachpress_pub_showhide('899','tp_abstract')\" title=\"Show abstract\" style=\"cursor:pointer;\">Abstract<\/a><\/span> | <span class=\"tp_resource_link\"><a id=\"tp_links_sh_899\" class=\"tp_show\" onclick=\"teachpress_pub_showhide('899','tp_links')\" title=\"Show links and resources\" style=\"cursor:pointer;\">Links<\/a><\/span> | <span class=\"tp_bibtex_link\"><a id=\"tp_bibtex_sh_899\" class=\"tp_show\" onclick=\"teachpress_pub_showhide('899','tp_bibtex')\" title=\"Show BibTeX entry\" style=\"cursor:pointer;\">BibTeX<\/a><\/span><\/p><div class=\"tp_bibtex\" id=\"tp_bibtex_899\" style=\"display:none;\"><div class=\"tp_bibtex_entry\"><pre>@article{fichtinger2018m,<br \/>\r\ntitle = {Configurable overall skill assessment in ultrasound-guided needle insertion},<br \/>\r\nauthor = {Matthew S Holden and Hillary Lia and Sean Xia and Zsuzsanna Keri and Tamas Ungi and Gabor Fichtinger},<br \/>\r\nurl = {http:\/\/perk.cs.queensu.ca\/sites\/perkd7.cs.queensu.ca\/files\/Holden2018b.pdf},<br \/>\r\nyear  = {2018},<br \/>\r\ndate = {2018-01-01},<br \/>\r\njournal = {16th annual imaging network Ontario symposium (ImNO)},<br \/>\r\nabstract = {METHODS: We implemented three configurable and transparent methods for overall skill assessment. The first method uses a weighted combination of percentile ranked metric values, where the weight associated with each performance metric is configurable. The second method uses a k-nearest neighbours approach, where the scale in each dimension of metric space is configurable. The third method uses a fuzzy inference system with kernel density estimates as the membership functions, where the user may add, remove, or weight fuzzy different if-then rules. These methods were all implemented within the Perk Tutor platform ( www. perktutor. org) which allows the input performance metrics and parameters to be configured. Furthermore, these methods are connected directly to the training system to provide immediate feedback. <br \/>\r\nWe conducted a retrospective validation study to compare the accuracy of skill \u2026},<br \/>\r\nkeywords = {},<br \/>\r\npubstate = {published},<br \/>\r\ntppubtype = {article}<br \/>\r\n}<br \/>\r\n<\/pre><\/div><p class=\"tp_close_menu\"><a class=\"tp_close\" onclick=\"teachpress_pub_showhide('899','tp_bibtex')\">Close<\/a><\/p><\/div><div class=\"tp_abstract\" id=\"tp_abstract_899\" style=\"display:none;\"><div class=\"tp_abstract_entry\">METHODS: We implemented three configurable and transparent methods for overall skill assessment. The first method uses a weighted combination of percentile ranked metric values, where the weight associated with each performance metric is configurable. The second method uses a k-nearest neighbours approach, where the scale in each dimension of metric space is configurable. The third method uses a fuzzy inference system with kernel density estimates as the membership functions, where the user may add, remove, or weight fuzzy different if-then rules. These methods were all implemented within the Perk Tutor platform ( www. perktutor. org) which allows the input performance metrics and parameters to be configured. Furthermore, these methods are connected directly to the training system to provide immediate feedback. <br \/>\r\nWe conducted a retrospective validation study to compare the accuracy of skill \u2026<\/div><p class=\"tp_close_menu\"><a class=\"tp_close\" onclick=\"teachpress_pub_showhide('899','tp_abstract')\">Close<\/a><\/p><\/div><div class=\"tp_links\" id=\"tp_links_899\" style=\"display:none;\"><div class=\"tp_links_entry\"><ul class=\"tp_pub_list\"><li><i class=\"fas fa-file-pdf\"><\/i><a class=\"tp_pub_list\" href=\"http:\/\/perk.cs.queensu.ca\/sites\/perkd7.cs.queensu.ca\/files\/Holden2018b.pdf\" title=\"http:\/\/perk.cs.queensu.ca\/sites\/perkd7.cs.queensu.ca\/files\/Holden2018b.pdf\" target=\"_blank\">http:\/\/perk.cs.queensu.ca\/sites\/perkd7.cs.queensu.ca\/files\/Holden2018b.pdf<\/a><\/li><\/ul><\/div><p class=\"tp_close_menu\"><a class=\"tp_close\" onclick=\"teachpress_pub_showhide('899','tp_links')\">Close<\/a><\/p><\/div><\/div><\/div><\/div><\/div><\/div>\n","protected":false},"featured_media":0,"template":"","meta":{"_acf_changed":false,"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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