TY  - JOUR 
T1  - Predictive factors for sperm retrieval and sperm injection outcomes in obstructive azoospermia: do etiology, retrieval techniques and gamete source play a role?
JO  - Clinics
A1  - Miyaoka, Ricardo
A1  - Esteves, Sandro C.
SN  - 1807-5932
UL  - 10.6061/clinics/2013(Sup01)12
VL  - 68 
Y1  - 2013
PB  - Brazil 
ER  -