Low-Dose Azathioprine Is Effective in Maintaining Remission in Steroid-Dependent Ulcerative Colitis:HY Shi, FKL Chan, WK Leung, MKK Li, CM Leung, SF Sze, JYL Ching, FH Lo, SWC Tsang, EHS Shan, LY Mak, BCY Lam, AJ Hui, WH Chow, MTL Wong,...