Advanced Age Is an Independent Risk Factor for Severe Infections and Mortality in Patients Given Anti–Tumor Necrosis Factor Therapy for Inflammatory Bowel Disease - Mario Cottone; Anna Kohn; Marco Daperno; Alessandro Armuzzi; Luisa Guidi; R. D’Incà; Fabrizio Bossa; Erika Angelucci; Livia Biancone; Paolo Gionchetti; Sandro Ardizzone; Claudio Papi; et al. (2010)