Bone mineral density and calcium regulating hormones in patients with inflammatory bowel disease (Crohn's disease and ulcerative colitis) - Scharla, S. H.; Minne, H. W.; Lempert, U. G.; Leidig, G.; Hauber, M.; Raedsch, R.; Ziegler, R. (Experimental and Clinical Endocrinology & Diabetes, 1994)