Li Youjin, Chief Physician, Doctoral Supervisor Specializes in the treatment of pediatric upper airway obstructive diseases such as tonsillar hypertrophy, adenoid hypertrophy, laryngomalacia, laryngeal stenosis, tracheal stenosis, as well as head and neck tumors. Also specializes in immunotherapy and integrated traditional Chinese and Western medicine treatment for pediatric allergic diseases, and genetic diagnosis and genetic counseling for congenital hearing loss in children. Current Positions: - Member of the Pediatric Bronchoscopy Collaborative Group of the 18th Respiratory Committee, Pediatrics Branch, Chinese Medical Association - Member of the Genetic Counseling Branch, Chinese Genetics Society, National Health Commission - Member of the Pediatric Otorhinolaryngology-Head and Neck Surgery Committee, Asia-Pacific Medical and Biological Immunology Society - Member of the Pediatric Otorhinolaryngology Expert Alliance, National Children's Medical Center and National Children's Clinical Research Center Overseas Training: From September 2016 to August 2018, visited the Department of Otorhinolaryngology at Boston Children's Hospital, Harvard Medical School, USA. Main Research Direction: Has long been engaged in research on the interaction between environment and genes in the pathogenesis of pediatric allergic diseases, accumulating extensive experience in epigenetics and bioinformatics related to pediatric allergic disease research.