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Authors
Soke, G. N.
Maenner, M. J.
Christensen, D.
Kurzius-Spencer, M.
Schieve, L. A.
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Article History
First Online: 9 March 2018
Compliance with Ethical Standards
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: All authors do not have a conflict of interest to report.
: All procedures performed in studies involving human participants were in accordance with ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. This study is a secondary data analysis of de-identified data previously collected in a surveillance system. Therefore, formal consent is not required.
