1. Department of General Surgery, Handan Central Hospital, Handan, Hebei 056000, P.R. China
2. Department of Nephrology, Affiliated Hospital of Hebei University of Engineering, Handan, Hebei 056002, P.R. China
3. Department of Gastroenterology, Handan Central Hospital, Handan, Hebei 056000, P.R. China
4. Department of Neurology, Handan Central Hospital, Handan, Hebei 056000, P.R. China