Quadruple-P study group 2022, ' Pessary or progesterone to prevent preterm birth in women with short cervical length : protocol of the 4-6 year follow-up of a randomised controlled trial (Quadruple-P) ', BMJ Open, vol. 12, no. 8, pp. e064049 . https://doi.org/10.1136/bmjopen-2022-064049 BMJ Open, 12, 8 BMJ Open, 12(8). BMJ Publishing Group Ltd BMJ Open, 12 BMJ open, 12(8). BMJ Publishing Group BMJ Open, 12(8). BMJ Publishing Group
BMJ open, 12(8):e060632. BMJ Publishing Group BMJ Open, 12(8):e060632. BMJ Publishing Group BMJ Open, 12(8), 1. BMJ Publishing Group Ltd Landman, A J E M C, van Limburg Stirum, E V J, van 't Hooft, J, Leemhuis, A G, Finken, M J J, van Baar, A L, Roseboom, T J, Ravelli, A C J, van Wely, M, Oosterlaan, J, Painter, R C, Pajkrt, E, Oudijk, M A & de Boer, M A 2022, ' Long-term outcomes following antenatal exposure to low-dose aspirin : study protocol for the 4-year follow-up of the APRIL randomised controlled trial ', BMJ Open, vol. 12, no. 8, e060632, pp. e060632 . https://doi.org/10.1136/bmjopen-2021-060632