Toxicity and Survival After Intensity-Modulated Proton Therapy Versus Passive Scattering Proton Therapy for NSCLC. - Gjyshi O; Xu T; Elhammali A; Boyce-Fappiano D; Chun SG; Gandhi S; Lee P; Chen AB; Lin SH; Chang JY; Tsao A; Gay CM; et al. (Journal of thoracic oncology : official publication of the International Association for the Study of Lung Cancer, 2021)