Family practice, 39(4), 662-668. Oxford University Press van Summeren, J J G T, Holtman, G A, Lisman-van Leeuwen, Y, van Ulsen-Rust, A H C, Vermeulen, K M, Tabbers, M M, Kollen, B J, Dekker, J H & Berger, M Y 2022, ' Cost-effectiveness of physiotherapy in childhood functional constipation : a randomized controlled trial in primary care ', Family Practice, vol. 39, no. 4, pp. 662-668 . https://doi.org/10.1093/fampra/cmab147 Family Practice, 39(4), 662-668. Oxford University Press