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Lang JM, Lieberman E, Ryan KJ, Monson RR.Lang JM, et al. Among authors: lieberman e.Am J Epidemiol. 1990 Aug;132(2):304-9. doi: 10.1093/oxfordjournals.aje.a115659.Am J Epidemiol. 1990.PMID: 2372009
Lang JM, Lieberman E, Cohen A.Lang JM, et al. Among authors: lieberman e.Epidemiology. 1996 Jul;7(4):369-76. doi: 10.1097/00001648-199607000-00006.Epidemiology. 1996.PMID: 8793362