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subscription/membership/fee required Elsevier Science https://linkinghub.elsevier.com/retrieve/pii/S1743-6095(20)30712-8
Erectile Dysfunction free resource MedlinePlus Health Information https://medlineplus.gov/erectiledysfunction.html
free resource PubMed Central https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/32736945/
free resource Europe PubMed Central https://europepmc.org/abstract/MED/32736945
subscription/membership/fee required Silverchair Information Systems https://academic.oup.com/jsm/article-lookup/doi/10.1016/j.jsxm.2020.06.009