Patients' perceptions of the impact of ulcerative colitis on social and professional life : results from the UC-LIFE survey of outpatient clinics in Spain - Calvet Calvo, Xavier (Universitat Autònoma de Barcelona. Departament de Medicina) ; Argüelles-Arias, Federico (UGC Digestivo Intercentros Hospitales Virgen Macarena-Rocío, Seville, Spain) ; López-Sanromán, Antonio (Hospital Universitario Ramón y Cajal (Madrid)) ; Cea-Calvo, Luis (Medical Affairs Department, Merck Sharp & Dohme, Madrid, Spain) ; Juliá, Berta (Medical Affairs Department, Merck Sharp & Dohme, Madrid, Spain) ; de Santos, Cristina Romero (Medical Affairs Department, Merck Sharp & Dohme, Madrid, Spain) ; Carpio, Daniel (Instituto de Investigación Sanitaria Galicia Sur)