[1] CHINESE UNIV HONG KONG,PRINCE WALES HOSP,DEPT SURG,COMBINED ENDOSCOPY UNIT,SHATIN,HONG KONG
[2] CHINESE UNIV HONG KONG,PRINCE WALES HOSP,DEPT MED,SHATIN,HONG KONG
[3] CHINESE UNIV HONG KONG,PRINCE WALES HOSP,CTR CLIN TRIALS & EPIDEMIOL RES,SHATIN,HONG KONG