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J Am Board Fam Med. 2016 Jul-Aug;29(4):508-11. doi: 10.3122/jabfm.2016.04.160022.
The Performance of Fertility Awareness-based Method Apps Marketed to Avoid Pregnancy.
Duane M, Contreras A, Jensen ET, White A
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J Am Board Fam Med. 2016 Jul-Aug;29(4):508-11. doi: 10.3122/jabfm.2016.04.160022.
Duane M, Contreras A, Jensen ET, White A