TY - JOUR AU - Turner, D; Walsh, C M; Benchimol, E I TI - Severe paediatric ulcerative colitis: incidence, outcomes and optimal timing for second-line therapy JO - Gut VL - 57 PY - 2008 DO - 10.1136/gut.2007.136481 L3 - PubMed-ID: 17981888 SP - 331 EP - 338 N1 - et al. ER -