- Correspondence to Dr Chen Li, Department of Traditional Chinese Medicine, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, China; ; Professor Wen Zhang, Department of Rheumatology, Peking Union Medical College Hospital, Chinese Academy of Medical Science & Peking Union Medical College, National Clinical Research Center for Dermatologic and Immunologic Diseases（NCRC-DID）, Beijing, China;
- Received February 28, 2020
- Revised April 10, 2020
- Accepted April 14, 2020
- First published April 24, 2020.
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