Operative time and radiation exposure was significantly lower in group B : 20 minutes ( range , 11.37 to 29.30 min ) versus 13.09 minutes ( range , 9.31 to 25 min ) ( P 0.009 ) , and 0.30 Gy ( range , 0.10 to 1.30 Gy ) versus 0.10 Gy ( range , 0.00 to 0.70 Gy ) ( P = 0.013 ) , respectively .