1. Department of Radiation Oncology, University of Colorado, Aurora, CO, USA
2. Director of Research, International Lymphoma Radiation Oncology Group and Professor and Section Chief of Hematology, Department of Radiation Oncology, The University of Texas MD Anderson Cancer, Houston, TX, USA
3. Guy's Cancer Centre, Guy's & St Thomas' NHS Foundation Trust, and School of Cancer & Pharmaceutical Sciences, King’s College London, London, UK