Table 1.

Study sites of the CoM (circumcision of men who have sex with men) Study.

City and province	Study site	Nature of study site
Beijing	Beijing You’an Hospital, Capital Medical University	Tertiary hospital
Tianjin	Tianjin Centers for Disease Control and Prevention	Provincial CDCa
Qingdao, Shangdong	Qingtong Volunteer Service Center for HIV/AIDS Prevention	NGOb
Guangzhou, Guangdong	Guangzhou Zhitong Public Service Center	NGO
Shenzhen, Guangdong	Shenzhen Rainbow 258 Center for Men	NGO
Foshan, Guangdong	Foshan Pengyou Care and Rescue Center for AIDS Prevention	NGO
Chongqing	AIDS/STDc Control and Prevention Institute, Chongqing CDC	Provincial CDC
Luzhou, Sichuan	Luzhou Red Ribbon Heart Association	NGO

^aCDC: centers for disease control and prevention.

^bNGO: nongovernmental organization.

^cSTD: sexually transmitted disease.