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Singer PA, Cooper DS, Daniels GH, Ladenson PW, Greenspan FS, Levy EG, Braverman LE, Clark OH, McDougall IR, Ain KV, Dorfman SG.Singer PA, et al.Arch Intern Med. 1996 Oct 28;156(19):2165-72.Arch Intern Med. 1996.PMID: 8885814