Stereotactic body radiation therapy for an unresectable FGF23-secreting tumor of the cervical spine: A case report and literature review. - Hockemeyer K; Purswani JM; Kim JK; Givi B; Zan E; Pacione D; Shapiro M; Laufer I; Feffer JB; Silverman JS (Journal of radiosurgery and SBRT, 2022)