American Journal of Epidemiology (Vol. 178, No. 1, Jul. 1, 2013).
aje.oxfordjournals.org/content/178/1?etoc
Educational Gerontology (Vol. 39, No. 9, September 2013).
www.ingentaconnect.com/content/routledg/uedg/2013/00000039/00000009/
American Journal of Epidemiology (Vol. 178, No. 1, Jul. 1, 2013).
aje.oxfordjournals.org/content/178/1?etoc
Educational Gerontology (Vol. 39, No. 9, September 2013).
www.ingentaconnect.com/content/routledg/uedg/2013/00000039/00000009/
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