I apologise for introducing two errors into this letter while editing it for print.

Firstly, the second sentence of the penultimate paragraph should have read:

"Pills, condoms, FABMs, and even depot medroxyprogesterone acetate require continuing commitment" [not "Pills, condoms, FABMs, and even implants require continuing commitment"].

Secondly, the initials at the start of the competing interests statement should have been DAV [not DAK, as published].

Finally, I should also have included a link to the full rapid response

http://www.bmj.com/content/345/bmj.e4908/rr/596880

at the end of the letter.

Competing interests: None declared