[Ren, Peng-yu] Xi An Jiao Tong Univ, Dept Neurosurg, Affiliated Hosp 2, Xian 710004, Shaanxi, Peoples R China.
[Ren, Peng-yu] Johns Hopkins Univ, Sch Med, Dept Otolaryngol Head & Neck Surg, Baltimore, MD 21205 USA.
[Li, Bo-wen] Johns Hopkins Univ, Sch Med, Div Hlth Sci Informat, Baltimore, MD 21205 USA.
[Wu, Ming; Dong, Shi-yao] Cent China Normal Univ, Sch Math & Stat, Wuhan 430079, Hubei, Peoples R China.
[Han, Peng] Xi An Jiao Tong Univ, Dept Otolaryngol Head & Neck Surg, Affiliated Hosp 1, Xian 710061, Shaanxi, Peoples R China.