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Lisa Romero, DrPH, MPH, Division of Reproductive Health, National Center for Chronic Disease Prevention, and Health Promotion, Centers for Disease Control and Prevention, 4770 Buford Highway, MS S107-2, Atlanta, GA 30341, USA. Email: eon1@cdc.gov
No competing financial interests exist.
This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.