1. Division of Gastroenterology, Department of Internal Medicine, Kaohsiung Veterans General Hospital, Kaohsiung 813, Taiwan
2. School of Medicine, National Yang-Ming University, Taipei 112, Taiwan
3. Department of Biological Sciences, National Sun Yat-sen University, Kaohsiung 804, Taiwan
4. College of Pharmacy and Health Care, Tajen University, Pingtung 907, Taiwan
5. Department of Health-Business Administration, Fooyin University, Kaohsiung 831, Taiwan