1 Department of Dermatology, Beijing Children's Hospital, Capital Medical University, National Key Discipline of Pediatrics, Key Laboratory of Major Diseases in Children, Ministry of Education, National Center for Children's Health, Beijing, People's Republic of China.
2 Department of Dermatology, The First Hospital of Hohhot, Hohhot, People's Republic of China.
3 Department of Allergy, The First Hospital of Hohhot, Hohhot, People's Republic of China.