Department of Gastroenterology;
JCHO Tokyo Takanawa Hospital;
Tokyo 108-8606;
Japan;
Department of Gastroenterology;
Graduate School of Medicine;
The University of Tokyo;
Tokyo 113-8655;
Japan;
Department of Gastroenterology;
Saitama International Medical Center;
Saitama Medical University;
Saitama 350-1298;
Japan;
Department of Gastroenterology and Hepatology;
Saitama Medical University International Medical Center;
Saitama 350-8550;
Japan;
Department of Gastroenterology;
Kitasato University;
Kanagawa 252-0375;
Japan;
Department of Gastroenterology;
Jichi Medical University;
Tochigi 329-0498;
Japan;
Department of Gastroenterology;
Tokai University;
Kanagawa 259-1193;
Japan;
Department of Gastroenterology;
Asahi General Hospital;
Chiba 289-2511;
Japan;
Department of Internal Medicine;
Japanese Red Cross Ashikaga Hospital;
Tochigi 326-0843;
Japan;
Department of Gastroenterology;
Kimitsu Central Hospital;
Chiba 292-8535;
Japan;
Department of Gastroenterology;
Yokohama City University Medical Center;
Kanagawa 232-0024;
Japan;
Department of Gastroenterology;
Showa University Northern Yokohama Hospital;
Kanagawa 242-0032;
Japan;
Department of Gastroenterology;
Saitama City Hospital;
Saitama 336-8522;
Japan;
Department of Gastroenterology;
Ageo Central General Hospital;
Saitama 362-8588;
Japan;
Division of Gastroenterology;
Department of Medicine;
Showa University School of Medicine;
Tokyo 142-8666;
Japan;
Department of Gastroenterology;
Toranomon Hospital;
Tokyo 105-0001;
Japan;
Department of Gastroenterology;
Gunma University;
Gunma 371-0034;
Japan;
Department of Gastroenterology;
Mitsui Memorial Hospital;
Tokyo 101-8643;
Japan;
Division of Gastroenterology and Hepatology;
Department of Internal Medicine;
Toho University Ohashi Medical Center;
Tokyo 153-0044;
Japan;
Department of Gastroenterology;
Chiba University;
Chiba 260-0856;
Japan;
Department of Gastroenterology;
Tokyo Medical University;
Tokyo 160-0023;
Japan;
Department of Gastroenterology;
Showa University Fujigaoka Hospital;
Kanagawa 227-8501;
Japan;
endoscopic; preoperative; biliary; drainage; Malignant; distal; biliary; obstruction; Periampullary; cancer; P;