1 Department of General Surgery, The First Affiliated Hospital of Anhui Medical University, Hefei, 230032, China.
2 Department of General Surgery, The First Affiliated Hospital of Anhui Medical University, Hefei, 230032, China. Electronic address: zhuyong0831@163.com.
3 Department of General Surgery, The First Affiliated Hospital of Anhui Medical University, Hefei, 230032, China; Anhui Public Health Clinical Center, Hefei, 230032, China. Electronic address: xuaman@ahmu.edu.cn.