Job stress and job satisfaction of physicians, radiographers, nurses and physicists working in radiotherapy: a multicenter analysis by the DEGRO Quality of Life Work Group oleh Bölling Tobias, Dormin Claudia, Rittweger Jutta, Pigorsch Steffi, Bayerl Anja, Herschbach Peter, Schäfer Christof, Vordermark Dirk, Sehlen Susanne, Wypior Hans, Zehentmayr Franz, Schulze Wolfgang, Geinitz Hans