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Mayo-Smith MF, Gordon V, Gillie E, Brett A.Mayo-Smith MF, et al.J Am Geriatr Soc. 1991 Nov;39(11):1085-8. doi: 10.1111/j.1532-5415.1991.tb02873.x.J Am Geriatr Soc. 1991.PMID: 1753046Clinical Trial.