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Froehling DA, Silverstein MD, Mohr DN, Beatty CW, Offord KP, Ballard DJ.Froehling DA, et al. Among authors: mohr dn.Mayo Clin Proc. 1991 Jun;66(6):596-601. doi: 10.1016/s0025-6196(12)60518-7.Mayo Clin Proc. 1991.PMID: 2046397