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Vetter NJ, Lewis PA, Ford D.Vetter NJ, et al. Among authors: lewis pa.Int Disabil Stud. 1990 Jan-Mar;12(1):22-7. doi: 10.3109/03790799009166598.Int Disabil Stud. 1990.PMID: 2145260
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Vetter NJ, Charny M, Lewis PA, Farrow S.Vetter NJ, et al. Among authors: lewis pa.Arch Gerontol Geriatr. 1990 Jan-Feb;10(1):49-56. doi: 10.1016/0167-4943(90)90043-6.Arch Gerontol Geriatr. 1990.PMID: 15374521
Roberts C, Crosby D, Dunn R, Evans K, Grundy P, Hopkins R, Jones JH, Lewis P, Vetter N, Walker P.Roberts C, et al.Health Serv J. 1995 Jan 12;105(5435):15.Health Serv J. 1995.PMID: 10140480No abstract available.