COVID‐19 among children with cancer in Greece (2020): Results from the Nationwide Registry of Childhood Hematological Malignancies and Solid Tumors (NARECHEM‐ST). Issue 8 (15th May 2021) - Baka, Margarita; Michos, Athanasios; Alexopoulou, A.; Bouka, P.; Bouka, E.; Dana, E.; Dimitriou, G.; Doganis,; Grivea, I.; Ioannidou, M.; Kourti, M.; Magkou, E.; et al.