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Freedman VA, Berkman LF, Rapp SR, Ostfeld AM.Freedman VA, et al. Among authors: ostfeld am.Am J Public Health. 1994 May;84(5):843-5. doi: 10.2105/ajph.84.5.843.Am J Public Health. 1994.PMID: 8179059Free PMC article.
Colantonio A, Kasl SV, Ostfeld AM, Berkman LF.Colantonio A, et al. Among authors: ostfeld am.Arch Phys Med Rehabil. 1996 Jun;77(6):562-6. doi: 10.1016/s0003-9993(96)90295-6.Arch Phys Med Rehabil. 1996.PMID: 8831472Free article.