Lightning may strike twice.
Huvos
A G
AG
D001859:Bone Neoplasms / Q000209:etiology; D006801:Humans; D009381:Neoplasms, Radiation-Induced / Q000209:etiology*; D012516:Osteosarcoma / Q000209:etiology; D011878:Radiotherapy / Q000009:adverse effects*; D012307:Risk Factors