Denison, F C, Norrie, J, Lawton, J, Norman, J E, Scotland, G, McPherson, G C, McDonald, A, Forrest, M, Hudson, J, Brewin, J, Peace, M, Clarkson, C, Brook-Smith, S, Morrow, S, Hallowell, N, Hodges, L & Carruthers, K F 2017, ' A pragmatic group sequential, placebo-controlled, randomised trial to determine the effectiveness of glyceryl trinitrate for retained placenta (GOT-IT) : a study protocol ', BMJ Open, vol. 7, no. 9, e017134 . < https://bmjopen.bmj.com/content/7/9/e017134 > BMJ Open Denison, F, Norrie, J, Lawton, J, Norman, J, Scotland, G, McPherson, G, McDonald, A, Forrest, M, Hudson, J, Brewin, J, Peace, M, Clarkson, C, Brook-Smith, S, Morrow, S, Hallowell, N, Hodges, L & Carruthers, K F 2017, ' A pragmatic group sequential placebo controlled randomised trial to determine the effectiveness of Glyceryl trinitrate for retained placenta (GOT-IT): a study protocol ', BMJ Open . https://doi.org/10.1136/bmjopen-2017-017134