1. Pediatric Oncology Laboratory, Molecular Oncology Research Center, Barretos Cancer Hospital, Barretos, SP, Brazil
2. Brazilian Childhood Germ Cell Tumor Study Group, Brazilian Pediatric Oncology Society, São Paulo, SP, Brazil
3. Department of Clinical Oncology, Barretos Cancer Hospital, Barretos, SP, Brazil
4. Barretos School of Health Sciences, Dr. Paulo Prata/FACISB, Barretos, SP, Brazil
5. Department of Pathology, Barretos Cancer Hospital, Barretos, SP, Brazil
6. Department of Otolaryngology and Head & Neck Surgery, Johns Hopkins University School of Medicine, Baltimore, MD, USA
7. Barretos Children's Cancer Hospital, Barretos, SP, Brazil