Interobserver delineation uncertainty in involved-node radiation therapy (INRT) for early-stage Hodgkin lymphoma: on behalf of the Radiotherapy Committee of the EORTC lymphoma grou... by Aznar, M, Girinsky, T, Aleman, B, Beijert, M, Hutchings, M, Lievens, Y, Meijnders, P, Petersen, P, Schut, D, Maraldo, M, van der Maazen, R, Specht, L