1. School of ManagementShanxi Medical University Taiyuan China
2. Chinese Evidence‐based Medicine Centre, West China HospitalSichuan University Chengdu China
3. State Key Laboratory of Grassland Agro‐ecosystems, College of Pastoral Agricultural Science and TechnologyLanzhou University Lanzhou China
4. Department of Otolaryngology‐Head and Neck SurgeryThe First Affiliated Hospital of Zhejiang Chinese Medical University Hangzhou China