Fig. 1From: A longitudinal study of fecal calprotectin and the development of inflammatory bowel disease in ankylosing spondylitisFlowchart of the study procedures. Ileocolonoscopies were performed at different thresholds of fecal calprotectin at baseline and 5-year follow-up. F-cal Fecal calprotectin, NSAID Nonsteroidal anti-inflammatory drugBack to article page