Global Radiotherapy: Current Status and Future Directions—White Paper oleh May Abdel-Wahab, Soehartati S. Gondhowiardjo, Arthur Accioly Rosa, Yolande Lievens, Noura El-Haj, Jose Alfredo Polo Rubio, Gregorius Ben Prajogi, Herdis Helgadottir, Eduardo Zubizarreta, Ahmed Meghzifene, Varisha Ashraf, Stephen Hahn, Tim Williams, Mary Gospodarowicz