. Author manuscript; available in PMC: 2018 Dec 1.
Published in final edited form as: Contraception. 2018 Sep 11;98(6):510–516. doi: 10.1016/j.contraception.2018.07.135
This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).