Predicting Endoscopic Disease Activity in Crohn’s Disease: A New and Validated Noninvasive Disease Activity Index (The Utrecht Activity Index).

Minderhoud IM, Steyerberg EW, van Bodegraven AA, van der Woude CJ, Hommes DW, Dijkstra G, Fidder HH, Schwartz MP, Oldenburg B.
Inflamm Bowel Dis. 2015 Oct;21(10):2453-9