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. 2022 Mar 3;12:3509. doi: 10.1038/s41598-022-07442-7

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Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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A map of the Hong Kong Special Administrative Region of China. The area is partitioned by tertiary planning units (TPUs) and emergency medical service (EMS) areas with targeted 12-min response time (shaded in pink). Areas not shaded represent country parks or non-populated lands. The map also shows locations of ambulance depots managed by the Fire Services Department (FSD) and hospitals with accident and emergency (A&E) services. (Generated by ArcGIS 10.7, URL: http://www.esri.com/software/arcgis/arcgis-for-desktop).