Pangkalbalam Public Health Centre, Bangka Belitung Archipelago, Pangkalpinang, Indonesia; Division of Gastroenterology, Department of Internal Medicine, Faculty of Medicine Universitas Indonesia Ciptomangunkusumo Hospital, Jakarta, Indonesia
Kurniawan, I., Pangkalbalam Public Health Centre, Bangka Belitung Archipelago, Pangkalpinang, Indonesia; Simadibrata, M., Division of Gastroenterology, Department of Internal Medicine, Faculty of Medicine Universitas Indonesia Ciptomangunkusumo Hospital, Jakarta, Indonesia