Name Info Provider Link
subscription/membership/fee required Elsevier Science https://linkinghub.elsevier.com/retrieve/pii/S0090-4295(09)03062-3
Erectile Dysfunction free resource MedlinePlus Health Information https://medlineplus.gov/erectiledysfunction.html
subscription/membership/fee required ClinicalKey https://www.clinicalkey.com/content/playBy?issn=&vol=76&issue=2&pgfirst=387