Examiners Variables (mm)  Sonographer n˚1  Sonographer n˚2  Sonographer n˚3  F  P 
Transverse diameter of the PV in its origin  9.40 ± 1.68  9.65 ± 1.67  9.80 ± 1.66  0.15  0.8 
Transverse diameter of the PV in its ending  9.62 ± 7.79  9.15 ± 1.70  9 ± 1.61  0.36  0.9 
Length of the PV  61.22 ± 15.48  61.30 ± 14  61.33 ± 13.22  0  0.9 
Number of terminal branches of the PV  2  2  2 

