Received: 11 October 2020
Accepted: 6 December 2020
First Online: 11 December 2020
Ethics approval and consent to participate
: Human subjects were not involved in this review article. No ethics approval or consent was sought.
: Not applicable
: Anabel Starosta and Catherine Gordon declare that they have no competing interests. Mark Hornstein is a consultant for Aetion and Abbvie, an author on UpToDate, and serves on the WINFertility Medical Advisory Board.