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Morrell RW, Park DC.Morrell RW, et al. Among authors: park dc.Psychol Aging. 1993 Sep;8(3):389-99. doi: 10.1037//0882-7974.8.3.389.Psychol Aging. 1993.PMID: 8216959
Morrell RW, Park DC, Poon LW.Morrell RW, et al. Among authors: park dc.Gerontologist. 1989 Jun;29(3):345-54. doi: 10.1093/geront/29.3.345.Gerontologist. 1989.PMID: 2759457