1. Dermatology Hospital of Southern Medical University, Guangzhou, People’s Republic of China
2. University of North Carolina Project – China, Guangzhou, People’s Republic of China
3. Zhuhai Xutong Voluntary Services Center, Zhuhai, People’s Republic of China
4. University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
5. Zhuhai Center for Diseases Control and Prevention, Zhuhai, People’s Republic of China