1. Department of Otolaryngology, The Second Hospital of Shandong University, Jinan, China
2. Department of Otolaryngology, Dongping County People's Hospital, Taian, China
3. Department of Allergy, Shandong Provincial Qianfoshan Hospital, The First Affiliated Hospital of Shandong First Medical University, Shandong Institute of Respiratory Diseases, Jinan, China