The impact of whole-brain radiation therapy on the long-term control and morbidity of patients surviving more than one year after gamma knife radiosurgery for brain metastases. - Varlotto,JM.; Flickinger,JC.; Niranjan,A.; Bhatnagar,A.; Kondziolka,D.; Lunsford,LD. (Int j Radiat Oncol Biol Phys, 2005)