1 Hebei General Hospital(Department of Glandular Surgery), Shijiazhuang, Hebei, 050051, PR China; North China University of Science and Technology(School of Clinical Medicine), Tangshan, Hebei, 063000, PR China.
2 Tianjin Medical University(School of Clinical Medicine), Tianjin, 300070, PR China.
3 Hebei General Hospital(Department of Glandular Surgery), Shijiazhuang, Hebei, 050051, PR China; Hebei Medical College(School of Clinical Medicine), Shijiazhuang, Hebei, 050051, PR China.
4 Hebei General Hospital(Department of Glandular Surgery), Shijiazhuang, Hebei, 050051, PR China.