1. Department of Medicine Federal University of Sao Joao del‐Rei Divinopolis Brazil
2. Department of Medicine Pontifical Catholic University of Sao Paulo São Paulo Brazil
3. Department of Medical Oncology Mackenzie Evangelical University Hospital Curitiba Brazil
4. Department of Pediatric Oncology Federal University of Sao Paulo Sao Paulo Brazil
5. Department of Surgery University of Toronto Toronto Ontario Canada