G. J. Hofmeyr,M. Singata-Madliki,T. A. Lawrie,E. Bergel and M. Temmerman. Effects of the copper intrauterine device versus injectable progestin contraception on pregnancy rates and method discontinuation among women attending termination of pregnancy services in South Africa: a pragmatic randomized controlled trial. Reproductive Health. 2016;13:10.1186/s12978-016-0153-9.