Demographic, clinical and treatment related predictors for event-free probability following low-dose radiotherapy for painful heel spurs – a retrospective multicenter study of 502 patients. - Muecke, Ralph; Micke, Oliver; Reichl, Berthold; Heyder, Rainer; Prott, Franz-Josef; Seegenschmiedt, M. Heinrich; Glatzel, Michael; Schneider, Oliver; Schäfer, Ulrich; Kundt, Guenther (Acta Oncologica, 2007)