1 Department of Dermatology, Beijing Tian Tan Hospital, Capital Medical University, Beijing 100059, China.
2 Department of Dermatology, No. 1 Hospital, Anhui Medical University, Hefei, Anhui 230022, China.
3 Department of Dermatology, Chinese Academy of Medical Sciences Peking Union Medical College, Peking Union Medical College Hospital, Beijing 100730, China.
4 Department of Dermatology, University of Pennsylvania, Philadelphia, PA 19104, USA.