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Haan J, van Kleef JW, Bloem BR, Zwartendijk J, Lanser JB, Brand R, van der Does IG, Krul EJ, Elshove HM, Moll AC, et al.Haan J, et al. Among authors: bloem br.J Am Geriatr Soc. 1991 Jun;39(6):596-600. doi: 10.1111/j.1532-5415.1991.tb03600.x.J Am Geriatr Soc. 1991.PMID: 1709958Clinical Trial.