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Fihn SD, McDonell MB, Vermes D, Henikoff JG, Martin DC, Callahan CM, Kent DL, White RH.Fihn SD, et al. Among authors: kent dl.J Gen Intern Med. 1994 Mar;9(3):131-9. doi: 10.1007/BF02600026.J Gen Intern Med. 1994.PMID: 8195911Clinical Trial.