Fig. 1

Patients selection process. A total of 175 patients with azoopspermia in the male infertility clinic were enrolled. Among them, 13 with genetic abnormality, 8 with mumps virus infection history, 13 with varicocele, 33 who received medical treatment, 37 with small testes, 8 with acquired sperm, 8 with MA and 18 with SCOS were excluded. The rest 35 patients diagnosed with hypospermatogenesis (HP) were enrolled