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von Känel R, Mausbach BT, Dimsdale JE, Mills PJ, Patterson TL, Ancoli-Israel S, Ziegler MG, Roepke SK, Allison M, Grant I.von Känel R, et al.J Gerontol A Biol Sci Med Sci. 2010 Sep;65(9):1004-11. doi: 10.1093/gerona/glq073. Epub 2010 May 19.J Gerontol A Biol Sci Med Sci. 2010.PMID: 20484338Free PMC article.