1 Department of Dermatology, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, China, Beijing, China.
2 Department of Dermatology, Zhengzhou University, Affiliated Children's Hospital, Henan Children's Hospital, Zhengzhou Children's Hospital, Zhengzhou, China.
3 Department of Neonatology and NICU, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, China, Beijing, China.
4 Department of Dermatology, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, China, Beijing, China bch_maleen@aliyun.com.