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European Journal of Epidemiology > 2009 > 24 > 11 > 683-690
Preventive Medicine > 2007 > 44 > 4 > 305-310
Aging Clinical and Experimental Research > 2006 > 18 > 5 > 394-404
Archives of Gerontology and Geriatrics > 1998 > 26 > 2 > 99 - 111