Table 1. Comparison of the sperm retrieval rate (SRR) between conventional and micro- testicular sperm extraction (TESE).

Year	Author	Case (n)	SRR by conventional TESE (%)	SRR by micro-TESE (%)
1999	Schlegel32	27	45	63
2000	Amer et al.36	100	30	47
2002	Okada et al.33	74	16.7	44.6
2002	Tsujimura et al.34	56	35.1	42.9
2004	Tsujimura et al.37	180	—	44.4
2005	Ramasamy et al.35	460	32	57
2005	Mulhall et al.38	48	50	45
2009	Ramasamy et al.39	792	—	60
2010	Ishikawa et al.40	150	—	42 (32, 44, 48)