Shikun Ma1, Jia Yin2, Nannan Jiang1. 1. Department of Allergy, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, China. 2. Department of Allergy, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, China. Electronic address: doctoryinjia@163.com.