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Commentary | 
S. Jay Olshansky, PhD; Thomas T. Perls, MD, MPH
JAMA. 2008;299(23):2792-2794. doi:10.1001/jama.299.23.2792.

Medical News & Perspectives | 
JAMA. 2002;288(22):2812. doi:10.1001/jama.288.22.2812-JMN1211-2-2.

Special Communication | 
Tero Kivelä, MD; Risto Pelkonen, MD; Matti Oja, PhD; et al.
JAMA. 1998;279(1):48-50. doi:10.1001/jama.279.1.48.

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