Prognostic factors in high-grade pediatric osteosarcoma among children and young adults: Greek Nationwide Registry for Childhood Hematological Malignancies and Solid Tumors (NARECHEM-ST) data along with a systematic review and meta-analysis

Εvgenia Papakonstantinou, Kleoniki I. Athanasiadou, Georgios Markozannes, Vassiliki Tzotzola, Evdoxia Bouka, Margarita Baka, Maria Moschovi, Sophia Polychronopoulou, Emmanuel Hatzipantelis, Vasiliki Galani, Kalliopi Stefanaki, Katerina Strantzia, Maria Vousvouki, Panagiota Kourou, Evgenia Magkou, Maria Nikita, Christos Zambakides, John Michelarakis, Aikaterini Alexopoulou, Maro Gavra, Astero Malama, Evangelia Ntzani, Eleni Petridou