[1] Jinan Univ, Zhuhai Peoples Hosp, Zhuhai Hosp, Dept Spine, Zhuhai 519000, Guangdong, Peoples R China
[2] Sun Yat Sen Univ, Affiliated Hosp 7, Dermatovenerol Digest Med Ctr, Shenzhen, Guangdong, Peoples R China
[3] Sun Yat Sen Univ, Affiliated Hosp 1, Dept Gastrointestinopancreat Surg, Guangzhou, Guangdong, Peoples R China