Re-irradiation: estimating NTCP when only the dDVHs for an OAR from the first and the second treatments are available. (December 2021) - Stavrev, P.; Stavreva, N.; Penev, D.; Ruggieri, R.; Nahum, A.E.; Balabanova, A.; Georgiev, D.; Gancheva, M.; Pressyanov, D.