1 Department of Otolaryngology, The Second Hospital of Shandong University, Jinan, Shandong, 250033, China.
2 Department of Allergy, Shandong Provincial Qianfoshan Hospital, The First Affiliated Hospital of Shandong First Medical University, Shandong Institute of Respiratory Diseases, Jinan, Shandong, 250013, China. Electronic address: qfsyyallergy@163.com.