Neurofibromatosis-associated malignant peripheral nerve sheath tumors in children have a worse prognosis: A nationwide cohort study. - Martin E; Coert JH; Flucke UE; Slooff WM; van de Sande MAJ; van Noesel MM; Grünhagen DJ; Wijnen MHWA; Verhoef C (Pediatric blood & cancer, 2020)