1. Heron MP, Hoyert DL, Xu J, Scott C, Tejada-Vera B. Deaths: preliminary data for 2006. National Vital Statistics Reports 2008;56(16).
2. Adams PF, Lucas JW, Barnes PM. Summary Health Statistics for U.S. Adults, 2008 (Ref Type: Electronic Citation). Available at: http://www.cdc.gov/nchs/data/series/sr_10/sr10_236.pdf .
3. Schoenborn CA, Vickerie JL, Powell-Griner E. Health characteristics of adults 55 years of age and over: United States, 2000–2003. Adv Data 2006;370:1–31.
4. Tomey KM, Sowers MR, Crandall C, Johnston J, Jannausch M, Yosef M. Dietary intake related to prevalent functional limitations in midlife women. Am J Epidemiol 2008;167(8):935–943.
5. Weiss CO, Boyd CM, Yu Q, Wolff JL, Leff B. Patterns of prevalent major chronic disease among older adults in the United States. JAMA 2007;298(10):1160–1162.