1. Dermatology Hospital, Southern Medical University, Guangzhou, China
2. Department of Epidemiology, School of Public Health, Southern Medical University, Guangzhou, China
3. Guangdong Eye Institute, Department of Ophthalmology, Guangdong Provincial People's Hospital (Guangdong Academy of Medical Sciences), Southern Medical University, Guangzhou, China; The Second School of Clinical Medicine, Southern Medical University, Guangzhou, China
4. Department of Urology, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou, China