The mean external diameter of the RGEA at the origin and at 5; 10; 15; 20 centimeters from the origin were 2.68 ± 0.52 mm; 2.37 ± 0.46 mm; 2.20 ± 0.47 mm; 1.94 ± 0.53 mm; 1.54 ± 0.50 mm, respectively.