1. Department of Infectious Diseases, Yidu Central Hospital of Weifang Affiliated to Weifang Medical University, Weifang, Shandong, China (mainland)
2. Emergency Department, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong, China (mainland)
3. Department of Vertigo Medicine, Qingzhou Hospital Affiliated to Shandong First Medical University, Weifang, Shandong, China (mainland)
4. Department of Infectious Diseases, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong, China (mainland)