1. In vitro sildenafil citrate use as a sperm motility stimulant
Taymour Mostafa, M.D. 
Fertility and Sterility 
Volume 88, Issue 4, Pages (October 2007)
DOI: /j.fertnstert
Copyright © 2007 American Society for Reproductive Medicine Terms and Conditions

2. Figure 1
Time course study of in vitro effect of sildenafil on sperm motility percent.
Mostafa. In vitro sildenafil citrate use as a sperm motility stimulant. Fertil Steril 2007.
Fertility and Sterility  , DOI: ( /j.fertnstert )
Copyright © 2007 American Society for Reproductive Medicine Terms and Conditions