Difficult-to-treat inflammatory bowel disease: results from an international consensus meeting

Tommaso Lorenzo Parigi, Ferdinando D'Amico, Maria T. Abreu, Axel Dignass, Iris Dotan, Fernando Magro, Anne M. Griffiths, Vipul Jairath, Marietta Iacucci, Gerassimos J. Mantzaris, Colm O'Morain, Walter Reinisch, David B. Sachar, Dan Turner, Takayuki Yamamoto, David T. Rubin, Laurent Peyrin-Biroulet, Subrata Ghosh, Silvio Danese^*