Gastroenterology Division;
Yokohama City University Hospital;
3-9 Fukuura;
Kanazawa-ku;
Yokohama;
Kanagawa 236-0004;
Japan;
Department of Medical Education;
Yokohama City University School of Medicine;
3-9 Fukuura;
Kanazawa-ku;
Yokohama;
Kanagawa 236-0004;
Japan;
Office of Postgraduate Medical Education;
Yokohama City University Hospital;
3-9 Fukuura;
Kanazawaku;
Yokohama;
Kanagawa 236-0004;
Japan;