Quality assurance of internal mammary node irradiation in the DBCG IMN2 study. - Refsgaard L; Buhl ES; Nielsen AWM; Thomsen MS; Andersen K; Jensen I; Berg M; Lorenzen EL; Thorsen LBJ; Overgaard J; Korreman SS; Offersen BV (Radiotherapy and oncology : journal of the European Society for Therapeutic Radiology and Oncology, 2025)