Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Evaluation of bladder neck location on introital ultrasonography relative to reference coordinate system. dx = the distance between the bladder neck and the central line of the symphysis; dy = the distance between the bladder neck and the axis perpendicular to the central line of the symphysis.
