Cum survival Characteristics Monitoring time 1 year 2 years 3 years 4 years Cum survival 79.7% 62.3% 52.3% 43.6% (CI: 95%, 67.5 - 87.7) (CI: 95%, 47.5 - 74.0) (CI: 95%, 36.2 - 66.2) (CI: 95%, 26.7 - 59.4) Mean cum survival 45.7 months (CI: 95%, 35.9 - 55.4) Mean monitoring time 21.7± 19.4 months (1.9 - 81.8) Comment: Mean cum survival 45.7 months (CI: 95%, 35.9 - 55.4).