Preoperative radiochemotherapy in locally advanced or recurrent rectal cancer: regional radiofrequency hyperthermia correlates with clinical parameters. - Rau,B.; Wust,P.; Tilly,W.; Gellermann,J.; Harder,C.; Riess,H.; Budach,V.; Felix,R.; Schlag,P.M. (Int J Radiat Oncol Biol Phys, 2000)