Woel RT, Munley MT, Hollis D, Fan M, Bentel G, Anscher MS, Shafman T, Coleman RE, Jaszczak RJ, Marks LB. The time course of radiation therapy-induced reductions in regional perfusion: a prospective study with >5 years of follow-up. Int J Radiat Oncol Biol Phys. 2002 Jan 01; 52(1):58-67.