Department of General Internal Medicine;
Saitama Medical University;
Saitama 350-0495;
Japan;
Center for Diagnostic and Therapeutic Endoscopy;
School of Medicine;
Keio University;
Tokyo 108-8345;
Japan;
Division of Gastroenterology;
Department of Internal Medicine;
School of Medicine;
Keio University;
Tokyo 108-8345;
Japan;
Cancer Center;
School of Medicine;
Keio University;
Tokyo 108-8345;
Japan;
Center for Preventive Medicine;
School of Medicine;
Keio University;
Tokyo 108-8345;
Japan;
Department of Surgery;
School of Medicine;
Keio University;
Tokyo 108-8345;
Japan;