http://rpsychologist.com/adherence-analysis-IV-brms

https://www.bmj.com/content/340/bmj.c2073.long - JB Sussman, RA Hayward 2010

gil16ratSup.pdf is from http://www.nejm.org/doi/10.1056/NEJMoa1602002

Excellent tweetorial:
https://twitter.com/EpiEllie/status/998261892081692672