1. Department of Gastrointestinal Surgery, First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330006, P.R. China
2. Department of Operating Room, Nanchang University Second Affiliated Hospital, Nanchang, Jiangxi 330006, P.R. China
3. Department of Thyroid Surgery, Nanchang University Second Affiliated Hospital, Nanchang, Jiangxi 330006, P.R. China