PD-0672: Effect of a vacuum mattress on bone & target intra-fraction motion during MR-guided lymph node SBRT. (November 2020) - Werensteijn-honingh, A.M.; Kroon, P.S.; Winkel, D.; Hooijdonk, C.G. Gadellaa-Van; Sikkes, G.G.; Vissers, N.G.P.M.; Eppinga, W.S.C.; Intven, M.; Raaymakers, B.W.; Jürgenliemk-Schulz, I.M.