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Article History

Received: 6 April 2018

Accepted: 15 June 2018

First Online: 25 June 2018

Authors’ information

: CBP is a Senior Research Scientist at the Guttmacher Institute and holds an Associate affiliation in the Department of Epidemiology at the Johns Hopkins Bloomberg School of Public Health. Author affiliation included for informational purposes only, as this work was not conducted under the auspices of the Guttmacher Institute. The views expressed herein are those of the authors and do not necessarily reflect the views of the Guttmacher Institute.

: Not applicable.

: Not applicable.

: The authors declare that they have no competing interests. As described in the commentary, CBP reached out directly with the Director of Medical Affairs for Valley Electronics in multiple emails during September 2017 to directly raise concern regarding prior inaccurate analyses and their use in marketing materials for Valley Electronics products. Also as noted, CBP is participating in the conduct of a forthcoming systematic review on the effectiveness of fertility awareness-based methods for pregnancy prevention.

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