@article{Smith2018,
author = {Smith, C. and Edwards, P. and Free, C.},
title= {Assessing the validity and reliability of self-report data on contraception use in the Mobile Technology for Improved Family Planning (MOTIF) randomised controlled trial},
year = {2018},
doi = {10.1186/s12978-018-0494-7},
volume = {15},
pages = {50},
}