International Atomic Energy Agency (IAEA), International Atomic Energy Agency (IAEA), Ghent University Hospital - Department of Radiation Oncology, King Hussein Cancer Center (KHCC), Wake Forest University, Medical University of South Carolina, UZ Brussel, Catholic University of Louvain (UCL), Federal University of Bahia (UFBA), Quanta Diagnóstico e Terapia - PET/CT Department, University of Pretoria, National Cancer Center of Mongolia, National Cancer Center of Mongolia, Mongolian National University of Medical Sciences, The Austin Hospital - Olivia Newton-John Cancer Research Institute, The Austin Hospital - Olivia Newton-John Cancer Research Institute, International Atomic Energy Agency (IAEA), International Atomic Energy Agency (IAEA), International Atomic Energy Agency (IAEA), International Atomic Energy Agency (IAEA), International Atomic Energy Agency (IAEA) and International Atomic Energy Agency (IAEA)