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Schwartz DA, Pemberton JH, Sandborn WJ.Schwartz DA, et al. Among authors: pemberton jh.Ann Intern Med. 2001 Nov 20;135(10):906-18. doi: 10.7326/0003-4819-135-10-200111200-00011.Ann Intern Med. 2001.PMID: 11712881Review.