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Journal of the American Geriatrics Society|August 5, 2005
Serum erythropoietin and aging: a longitudinal analysisWilliam B Ershler, Shan Sheng, Julie McKelvey, et al.
The American Journal of Medicine|November 26, 2008
Immunity from smallpox vaccine persists for decades: a longitudinal studyDennis D Taub, William B Ershler, Mark Janowski, et al.
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