1. Department of Otolaryngology, West China Hospital of Sichuan University, Chengdu, Sichuan, China;
2. Department of Otolaryngology Head and Neck, Karolinska University Hospital, Karolinska Institute, Stockholm, Sweden;
3. Department of Clinical Science, Intervention and Technology, Karolinska University Hospital, Karolinska Institute, Stockholm, Sweden;
4. Department of Medicine Epidemiology and Biostatistics, Karolinska University, Stockholm, Sweden