International multidisciplinary classification of acute pancreatitis severity: the 2013 Spanish Edition - Maravi-poma, E.; Dellinger, E. Patchen; Forsmark, C. E.; Layer, P; Levy, P; Shimesegawa, T; Siriwardena, A. K; Omo, G; Whitcomb, D. C; Soriano, Francisco Garcia (Medicina intensiva, 2014)