TY  - JOUR 
T1  - The approach to the difficult urethral catheterization among urology residents in the United States
JO  - International braz j urol
A1  - Villanueva, Carlos
A1  - Hemstreet III, George P.
SN  - 1677-5538
UL  - 10.1590/S1677-55382010000600009
VL  - 36 
Y1  - 2010
PB  - Brasil 
ER  -