An official website of the United States government
The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before
sharing sensitive information, make sure you’re on a federal
government site.
The site is secure.
The https:// ensures that you are connecting to the
official website and that any information you provide is encrypted
and transmitted securely.
Boyle CA, Berkowitz GS, Kelsey JL.Boyle CA, et al. Among authors: kelsey jl.Am J Public Health. 1987 Mar;77(3):349-50. doi: 10.2105/ajph.77.3.349.Am J Public Health. 1987.PMID: 3812845Free PMC article.
Kelsey JL, White AA 3rd, Pastides H, Bisbee GE Jr.Kelsey JL, et al.J Bone Joint Surg Am. 1979 Oct;61(7):959-64.J Bone Joint Surg Am. 1979.PMID: 158597Review.
Li W, Land T, Zhang Z, Keithly L, Kelsey JL.Li W, et al. Among authors: kelsey jl.Am J Public Health. 2009 Mar;99(3):470-9. doi: 10.2105/AJPH.2007.130112. Epub 2009 Jan 15.Am J Public Health. 2009.PMID: 19150913Free PMC article.