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Scudds RJ, Robertson JM.Scudds RJ, et al. Among authors: robertson jm.J Gerontol A Biol Sci Med Sci. 2000 Jul;55(7):M393-9. doi: 10.1093/gerona/55.7.m393.J Gerontol A Biol Sci Med Sci. 2000.PMID: 10898256
Robertson JM, Donner AP, Trevithick JR.Robertson JM, et al.Ann N Y Acad Sci. 1989;570:372-82. doi: 10.1111/j.1749-6632.1989.tb14936.x.Ann N Y Acad Sci. 1989.PMID: 2629606