Commentary: Worldwide Knowledge and Attitude of Spine Surgeons Regarding Radiation Exposure. Issue 4 (7th June 2018) - Falavigna, Asdrubal; Ramos, Miguel Bertelli; Wong, Chung Chek; Barbagallo, Giuseppe; Brodke, Darrel; Al-Mutair, Abdulaziz; Ghogawala, Zoher; Riew, K Daniel