Pregnancies achieved after frozen-thawed pronuclear oocytes obtained by intracytoplasmic sperm injection with spermatozoa extracted from frozen-thawed testicular tissues from non-obstructive azoospermic men

S. Al-Hasani^*, L. C. Demirel, B. Schöpper, M. Bals-Pratsch, N. Nikolettos, W. Küpker, M. Ugur, R. Sturm, K. Diedrich

^*Corresponding author for this work