Department of Anorectal Surgery,The First Affiliated Hospital,China Medical University,Shenyang 110001,China;
Department of Anorectal Surgery,The First Affiliated Hospital,China Medical University,Shenyang 110001,China;
Department of Pathology,College of Basic Medical Sciences,China Medical University,Shenyang 110001,China;
China Criminal Police College,Shenyang 110035,China;