1. Department of Dermatology, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou, China;
2. Johns Hopkins University Bloomberg School of Public Health, Baltimore, MD, USA;
3. Division of Infectious Diseases, Rhode Island Hospital, Warren Alpert Medical School of Brown University, Providence, RI, USA;
4. Dermatology Hospital of Southern Medical University, Guangzhou, China