1. Department of Neurosurgery, Queen Mary College of Nanchang University, Nanchang, Jiangxi 330006, P.R. China
2. First Clinical Medical College, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330006, P.R. China
3. Department of Gastrointestinal Surgery, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330006, P.R. China