INFLUENCING FACTORS ON THE DEVELOPMENT OF PHYSICAL FUNCTIONING OF OLDER CANCER PATIENTS DURING AND 12 MONTHS AFTER CANCER THERAPY: RESULTS OF A PROSPECTIVE OBSERVATIONAL STUDY. (November 2019) - Kooymann, J.; Witte, S.; Medenwald, D.; Golla, A.; Stangl, G.; Steckelberg, A.; Vordermark, D.; Schmidt, H.