PO-0746: Inter-observer variation in GTV delineation of bone metastases: a multicenter study. (May 2017) - Gerlich, A.S.; Van der Velden, J.M.; Kotte, A.N.T.J.; Tseng, C.L.; Fanetti, G.; Eppinga, W.S.C.; Kasperts, N.; Intven, M.P.W.; Pameijer, F.A.; Philippens, M.E.P.; Verkooijen, H.M.; Seravalli, E.