RT Journal Article SR Electronic T1 The legitimacy of modelling the impact of an intervention based on important intermediate outcomes in a trial JF BMJ Global Health FD BMJ Publishing Group Ltd SP e001222 DO 10.1136/bmjgh-2018-001222 VO 3 IS 5 A1 Simon Cousens A1 Roy Head YR 2018 UL http://gh.bmj.com/content/3/5/e001222.abstract AB