作者单位:Clinical Laboratory DepartmentYokohama City University HospitalYokohama,Japan[1]Department of Gastroenterology and HepatologyYokohama City University Graduate School of[2]Department of Internal MedicineYuai ClinicYokohama,Japan[3]Department of GastroenterologyInternational University of Health and Welfare Atami HospitalAtami[4]