Heterogeneity of study endpoints in stereotactic body radiation therapy studies for bone metastases: A systematic review. - Lee SF; Wong HCY; Oldenburger E; Raman S; Marta GN; Chan AW; Rades D; van der Linden YM; van der Velden JM; Nguyen QN; Choi JI; Hircock C; et al. (Journal of radiosurgery and SBRT, 2025)