TOPAS-nBio: An Extension to the TOPAS Simulation Toolkit for Cellular and Sub-cellular Radiobiology Schuemann, J. ; McNamara, A. L. ; Ramos-Méndez, J. ; Perl, J. ; Held, K. D. ; Paganetti, H. ; Incerti, S. ; Faddegon, B. Abstract Publication: Radiation Research Pub Date: January 2019 DOI: 10.1667/RR15226.1 Bibcode: 2019RadR..191..125S