1 National Center for Children's Health, Department of Dermatology, Beijing Children's Hospital, Capital Medical University, No. 56 Nan Lishi Rd, Xicheng District Beijing, 100045 China.
2 National Center for Children's Health, Department of Dermatology, Beijing Children's Hospital, Capital Medical University, No. 56 Nan Lishi Rd, Xicheng District Beijing, 100045 China. Electronic address: [email protected].