Neoplasms, Vascular Tissue

• Mayo Clinic Arizona — Scottsdale, Arizona, United States
• University of Nebraska — Omaha, Nebraska, United States
• Portsmouth Regional Hospital Hematology/Oncology Clinic — Portsmouth, New Hampshire, United States

• City of Hope — Duarte, California, United States

• Cincinnati Children's Hospital Medical Center — Cincinnati, Ohio, United States

• UCSF Cancer Center and Cancer Research Institute — San Francisco, California, United States
• Children's National Medical Center — Washington D.C., District of Columbia, United States
• Children's Memorial Hospital - Chicago — Chicago, Illinois, United States
• Duke Comprehensive Cancer Center — Durham, North Carolina, United States

• Warren Grant Magnuson Clinical Center - NCI Clinical Studies Support — Bethesda, Maryland, United States

• Duke Comprehensive Cancer Center — Durham, North Carolina, United States

Not specified

• Instituto de Tratamento do Câncer Infantil (Pediatric Cancer Treatment Institute) - ITACI - ICr-HCFMUSP (Instituto da Criança do Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo) — São Paulo, Brazil

• Laser and Skin Surgery Center of New York — New York, United States

• Pediatric Surgery, Kinderkrankenhaus Bult — Hanover, Hannover, Germany
• Pediatric Surgery, Hannover Medical School — Hanover, Lower Saxony, Germany
• Kinderzentrum Klinikum Hildesheim — Hildesheim, Lower Saxony, Germany