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.
Shaw GM, Yang W, Roberts EM, Kegley SE, Stevenson DK, Carmichael SL, English PB.Shaw GM, et al. Among authors: carmichael sl.Epidemiology. 2018 Jan;29(1):8-21. doi: 10.1097/EDE.0000000000000757.Epidemiology. 2018.PMID: 28926371Free PMC article.
Carmichael SL, Shaw GM, Neri E, Schaffer DM, Selvin S.Carmichael SL, et al.Matern Child Health J. 2002 Sep;6(3):151-7. doi: 10.1023/a:1019722011688.Matern Child Health J. 2002.PMID: 12236662