The FOAM study : Is Hysterosalpingo foam sonography (HyFoSy) a cost-effective alternative for hysterosalpingography (HSG) in assessing tubal patency in subfertile women? Study protocol for a randomized controlled trial

van Rijswijk, J, van Welie, N, Dreyer, K, van Hooff, M H A, de Bruin, J P, Verhoeve, H R, Mol, F, Kleiman-Broeze, K A, Traas, M A F, Muijsers, G J J M, Manger, A P, Gianotten, J, de Koning, C H, Koning, A M H, Bayram, N, van der Ham, D P, Vrouenraets, F P J M, Kalafusova, M, van de Laar, B I G, Kaijser, J, van Oostwaard, M F, Meijer, W J, Broekmans, F J M, Valkenburg, O, van der Voet, L F, van Disseldorp, J, Lambers, M J, Peters, H E, Lier, M C I, Lambalk, C B, van Wely, M, Bossuyt, P M M, Stoker, J, van der Veen, F, Mol, B W J & Mijatovic, V 2018, 'The FOAM study : Is Hysterosalpingo foam sonography (HyFoSy) a cost-effective alternative for hysterosalpingography (HSG) in assessing tubal patency in subfertile women? Study protocol for a randomized controlled trial', BMC Women's Health, vol. 18, 64, pp. 1-7. https://doi.org/10.1186/s12905-018-0556-6