1 Department of Otorhinolaryngology Head & Neck Surgery, Beijing Chaoyang Hospital, Capital Medical University, Beijing, China.
2 Center for Statistical Science, Department of Industrial Engineering, Tsinghua University, Beijing, China.
3 Department of Otorhinolaryngology Head & Neck Surgery, Beijing Chaoyang Hospital, Capital Medical University, No.8 Gongti Road, Chaoyang District, Beijing, 100020, China. E-mail: [email protected].