Validation of Rome II criteria for functional gastrointestinal disorders by factor analysis of symptoms in Asian patient sample. - KWAN, AMBROSE CHI-PONG; BAO, TRAN NGOC; CHAKKAPHAK, SURIYA; CHANG, FULL-YOUNG; KE, MEI YUN; LAW, NGAI MOH; LEELAKUSOLVONG, SOMCHAI; LUO, JIN YAN; MANAN, CHUDAHMAN; PARK, HYO JIN; PIYANIRAN, WANICH; QURESHI, AKHTAR; et al. (Journal of Gastroenterology & Hepatology, 2003)