1. Varicocele: a bilateral disease
Yigal Gat, M.D., Gil N Bachar, M.D., Zvi Zukerman, M.D., Alexander Belenky, M.D., Ph.D., Michael Gornish, M.D. 
Fertility and Sterility 
Volume 81, Issue 2, Pages (February 2004)
DOI: /j.fertnstert

2. FIGURE 1
Changes in semen parameters after embolization of varicocele in 255 infertile men. (□ = Before embolization; ■ = After embolization.)
Gat. Varicocele: a bilateral disease.Fertil Steril 2004.
Fertility and Sterility  , DOI: ( /j.fertnstert )