1 Division of Gastroenterology, Department of Internal Medicine, Kaohsiung Veterans General Hospital and National Yang-Ming University, Kaohsiung, Taiwan.
2 Environmental and Preventive Medicine, Oita University Faculty of Medicine, Oita, Japan.
3 University of Malaya Combined Endoscopy Unit, University of Malaya Medical Center, Kuala Lumpur, Malaysia.
4 Department of Pediatrics, Azienda Ospedaliero Universitaria, University Hospital, Parma, Italy.
5 Division of Gastroenterology, Department of Internal Medicine, Kaohsiung Medical University Hospital and Kaohsiung Medical University, Kaohsiung, Taiwan.
6 Gastrointestinal Unit, Chulalongkorn University and Bangkok Medical Center, Bangkok, Pathum Thani, Thailand.