Yu-Di Chen1, Karoline Krause2, Ping Tu1, Zuo-Tao Zhao3, Marcus Maurer4. 1. Department of Dermatology and Venereology, Peking University First Hospital, Beijing, China; Beijing Key Laboratory of Molecular Diagnosis on Dermatoses, Beijing, China; National Clinical Research Center for Skin and Immune Diseases, Beijing, China. 2. Dermatological Allergology, Allergie-Centrum-Charité, Department of Dermatology and Allergy, Charité - Universitätsmedizin Berlin, Berlin, Germany. 3. Department of Dermatology and Venereology, Peking University First Hospital, Beijing, China; Beijing Key Laboratory of Molecular Diagnosis on Dermatoses, Beijing, China; National Clinical Research Center for Skin and Immune Diseases, Beijing, China. Electronic address: zhaozuotaotao@163.com. 4. Dermatological Allergology, Allergie-Centrum-Charité, Department of Dermatology and Allergy, Charité - Universitätsmedizin Berlin, Berlin, Germany. Electronic address: marcus.maurer@charite.de.