Mean operative time of one-stage operation was longer than of the 1ststage of multi-stage operation (178.8 ± 46.3 vs 119.6 ± 56.8 minutes) while mortality and morbidity of one-stage operation were lower than of the1ststage of multi-stage operation (2.8% and 11.4% vs 16.7% and 37.5%, respectively).