A Pay-It-Forward Approach to Improve Chlamydia and Gonorrhea Testing Uptake Among Female Sex Workers in China: Venue-Based Superiority Cluster Randomized Controlled Trial

Weiming Tang   ^{1, 2, 3} , PhD ;   Yewei Xie   ^{3, 4} , MSc ;   Mingzhou Xiong   ^{1, 2} , MD ;   Dan Wu   ^{3, 5, 6} , PhD ;   Jason J Ong   ^{5, 7} , MD, PhD ;   Teodora Elvira Wi   ⁸ , MD ;   Bin Yang   ^{1, 2} , PhD ;   Joseph D Tucker   ^{3, 5} , PhD ;   Cheng Wang   ^{1, 2} , PhD

¹ Dermatology Hospital of Southern Medical University, Guangzhou, China

² Southern Medical University Institute for Global Health, Guangzhou, China

³ University of North Carolina at Chapel Hill Project-China, Guangzhou, China

⁴ Health Service & System Research programme, Duke-NUS Medical School, Singapore, Singapore

⁵ Department of Clinical Research, Faculty of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, London, United Kingdom

⁶ West China School of Public Health, Sichuan University, Chengdu, China

⁷ Central Clinical School, Faculty of Medicine, Monash University, Melbourne, Australia

⁸ Department of Global HIV, Hepatitis and STI Programmes, World Health Organization Headquarters, Geneva, Switzerland