Shen B, Remzi FH, Oikonomou IK, Lu H, Lashner BA, Hammel JP, Skugor M, Bennett AE, Brzezinski A, Queener E, Fazio VW. Risk factors for low bone mass in patients with ulcerative colitis following ileal pouch-anal anastomosis. Am J Gastroenterol. 2009 Mar; 104(3):639-46.