BMJ Publishing Group Limited (BMJ) disclaims all liability and responsibility arising from any reliance Supplemental material placed on this supplemental material which has been supplied by the author(s) BMJ Open

Yunnan Kunming Chongqing Chongqing Ningxia Yinchuan Xian Shanxi Xianyang Northwest Jilin Changchun Jilin Songyuan Baicheng Heillongjiang Haerbin Jinzhou Fushun Northeast Shenyang Liaoning Anshan Fuxin Dalian

Appendix Table 2: Participants’ originated countries (6 continents, 77 countries) Continent Country Afghanistan Bangladesh Georgia India Indonesia Iran Malaysia Nepal Asia Pakistan Philippines Pakistan Saudi Arabia Syria Tajikistan Thailand Uzbekistan Britain England France Germany Europe Great Britain Italy Russia Sweden

Hall BJ, et al. BMJ Open 2021; 11:e048012. doi: 10.1136/bmjopen-2020-048012 BMJ Publishing Group Limited (BMJ) disclaims all liability and responsibility arising from any reliance Supplemental material placed on this supplemental material which has been supplied by the author(s) BMJ Open

United Kingdom South America Bolivia America Canada North America Cuba Jamaica Australia Oceania New Zealand Papua New Guinea African Benin Botswana Burkina Faso Burundi Cameroon Chad Congo Dr Congo Egypt Ephiopia Equatorial Guinea Eritrea Eswatini Ethiopia Ghana Guinea Africa Guiné-Bissau Haiti Ivory Coast Kenya Kingdom of Eswatini Lesotho Liberia Madagascar Malawi Mali Maurice Morocco Mozambique Namibia Nigeria Rwanda Senegal

Hall BJ, et al. BMJ Open 2021; 11:e048012. doi: 10.1136/bmjopen-2020-048012 BMJ Publishing Group Limited (BMJ) disclaims all liability and responsibility arising from any reliance Supplemental material placed on this supplemental material which has been supplied by the author(s) BMJ Open

Sierra Leone Somalia South Africa South Sudan Sudan Swaziland Tanzania Uganda Zambia Zimbabwe

Hall BJ, et al. BMJ Open 2021; 11:e048012. doi: 10.1136/bmjopen-2020-048012