@misc{indiciaecde60639fdf3,
  title = {Sildenafil citrate and sperm function.},
  author = {R L Siegel},
  year = {2001},
  doi = {10.1067/mob.2001.111092},
  url = {https://pubmed.ncbi.nlm.nih.gov/11262489/},
  note = {Source identifier: 11262489}
}