1) Levin HS : Testicular biopsy in the study of male infertility. Hum Pathol 10 : 569─584, 1979
2) Devroey P, Liu J, Nagy Z, et al : Pregnancies alter testicular sperm extraction and intracytoplasmic sperm injection in non-obstructive azoospermia. Hum Reprod 10 : 1457─1460, 1995
3) Gil-Salom M, Minguez Y, Rubio C, et al : Efficacy of intracytoplasmic sperm injection using testicular spermatozoa. Hum Reprod 10 : 3166─3170, 1995
4) Hauser R, Botchan A, Amit A, et al : Multiple testicular sampling in non-obstructive azoospermia-is it necessary? Hum Reprod 13 : 3081─3085, 1998
5) Amer M, El Haggar S, Moustafa T, et al : Testicular sperm extraction : impact of testicular histology on outcome, number of biopsies to be performed and optimal time for repetition. Hum Reprod 14 : 3030─3034, 1999
6) Ezeh UI, Moore HD and Cooke ID : A prospective study of multiple needle biopsies versus a single open biopsy for testicular sperm extraction in men with non-obstructive azoospermia. Hum Reprod 13 : 3075─3080, 1998
7) Tournaye H, Camus M, Goossens A, et al : Recent concepts in the management of infertility because of non-obstructive azoospermia. Hum Reprod 10 : 115─119, 1995
8) Schlegel PN : Testicular sperm extraction : microdissection improves sperm yield with minimal tissue excision. Hum Reprod 14 : 131-135, 1999
9) Ishikawa T, Nose R, Yamaguchi K, et al : Learning curves of microdissection testicular sperm extraction for non-obstructive azoospermia. Fertil Steril 94 : 1008─1011, 2010
10) Tsujimura A, Miyagawa Y, Takao T, et al : Salvage microdissection testicular sperm extraction after failed conventional testicular sperm extraction in patients with nonobstructive azoospermia. J Urol 175 : 1446─1449, 2006
11) Ben-Ami I, Raziel A, Strassburger D, et al : Intracytoplasmic sperm injection outcome of ejaculated versus extracted testicular spermatozoa in cryptozoospermic men. Fertil Steril 99 : 1867─1871, 2013
12) Herwig R, Tosun K, Schuster A, et al : Tissue perfusion-controlled guided biopsies are essential for the outcome of testicular sperm extraction. Fertil Steril 87 : 1071─1076, 2007
13) Tournaye H, Verheyen G, Nagy P, et al : Are there any predictive factors for successful testicular sperm recovery in azoospermic patients? Hum Reprod 12 : 80─86, 1997
14) Seo JT and Ko WJ : Predictive factors of successful testicular sperm recovery in non-obstructive azoospermia patients. Int J Androl 24 : 306─310, 2001
15) Anniballo R, Ubaldi F, Cobellis L, et al : Criteria predicting the absence of spermatozoa in the Sertoli cell-only syndrome can be used to improve success rates of sperm retrieval. Hum Reprod 15 : 2269─2277, 2000
16) Silber S, Nagy Z, Devroey P, et al : Distribution of spermatogenesis in the testicles of azoospermic men : the presence or abscence of spermatids in the testes of men with germinal failure. Hum Reprod 12 : 2422─2428, 1997
17) Schlegel PN and Su LM : Physiological consequences of testicular sperm extraction. Hum Reprod 12 : 1688─1692, 1997
18) Gil-Salom M, Romero J, Minguez Y, et al : Testicular sperm extraction and intracytoplasmic sperm injection : A chance of fertility in nonobstructive azoospermia. J Urol 160 : 2063─2067, 1998
19) Krausz C, Quinatana-Murci L and Mcelreavey K : Prognostic value of Y deletion analysis : What is the clinical prognostic value of Y chromosome microdeletion analysis? Hum Reprod 15 : 1431─1434, 2000
20) Bromage SJ, Falconer DA, Lieberman BA, et al : Sperm retrieval rates in subgroups of primary azoospermic males. Eur Urol 51 : 534─539, 2007