Toussaint, L, Brandal, P, Embring, A, Engellau, J, Evensen, M E, Griskeviskius, R, Hansen, J, Hietala, H, Wickart Johansson, G, Jørgensen, M, Kramer, P H, Kristensen, I, Lehtio, K, Magelssen, H, Maraldo, M V, Marienhagen, K, Martinsson, U, Nilsson, K, Peters, S, Plaude, S, Seiersen, K, Sendiuliene, D, Smulders, B, Edvardsen, T, Søbstad, J M, Taheri, Z, Vaalavirta, L, Vestergaard, A, Timmermann, B, Lassen-Ramshad, Y & for the NOPHO Radiotherapy Working Group 2022, ' Inter-observer variation in target delineation and dose trade-off for radiotherapy of paediatric ependymoma ', Acta Oncologica, vol. 61, no. 2, pp. 235-238 . https://doi.org/10.1080/0284186X.2021.2022202