Factors influencing local relapse and survival and results of salvage treatment after breast-conserving therapy in operable breast cancer: EORTC trial 10801, breast conservation compared with mastectomy in TNM stage I and II breast cancer. - van Dongen,J.A.; Bartelink,H.; Fentiman,I.S.; Lerut,T.; Mignolet,F.; Olthuis,G.; van der Schueren,E.; Sylvester,R.; Tong,D.; Winter,J. (Eur J Cancer, 1992)