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.
The measurement arrangement plan of a phantom study. (Measurements were made at the positions of the black dots (each separated from the other by 50 cm.)) Positions of staff relative to the patient and X-ray tube during the ERCP procedure: P = Physician (endoscopist), Q = 1st nurse, R = 2nd nurse, S = assistant physician.
