1. Laboratory of Dermatology, Beijing Pediatric Research Institute, Beijing Children’s Hospital, Capital Medical University, Key Laboratory of Major Diseases in Children, Ministry of Education, National Center for Children’s Health, Beijing, People’s Republic of China
2. The Inner Mongolia Autonomous Region Comprehensive Center for Disease Control and Prevention, Hohhot, People’s Republic of China
3. Department of Dermatology, Beijing Children’s Hospital, Capital Medical University, National Center for Children’s Health, Beijing, People’s Republic of China
4. Department of Dermatology, International Mongolian Hospital of Inner Mongolia, Hohhot, People’s Republic of China
5. Department of Dermatology, The First Hospital of Hohhot, Hohhot, People’s Republic of China
6. Department of Dermatology, Dengkou County People’s Hospital, Bayannur, People’s Republic of China
7. Department of Pathology, Beijing Children’s Hospital, Capital Medical University, National Center for Children’s Health, Beijing, People’s Republic of China