1. From the Department of Dermatology, Jiangsu Key Laboratory of Molecular Biology for Skin Diseases and Sexually Transmitted Infections, Hospital for Skin Diseases, Institute of Dermatology, Chinese Academy of Medical Sciences and Peking Union Medical College, Nanjing, China
2. Center for Global Health, School of Public Health, Nanjing Medical University, Nanjing, China E-mail: zengrong2010@hotmail.com, limin@pumcderm.cams.cn