Comparison between observation policy and fractionated stereotactic radiotherapy (SRT) as an initial management for vestibular schwannoma. - Shirato,H.; Sakamoto,T.; Sawamura,Y.; Kagei,K.; Isu,T.; Kato,T.; Fukuda,S.; Suzuki,K.; Soma,S.; Inuyama,Y.; Miyasaka,K. (Int J Radiat Oncol Biol Phys, 1999)