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	subscription/membership/fee required	Elsevier Science	https://linkinghub.elsevier.com/retrieve/pii/S0022-5347(15)04292-5
Erectile Dysfunction	free resource	MedlinePlus Health Information	https://medlineplus.gov/erectiledysfunction.html
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	subscription/membership/fee required	Wolters Kluwer	https://www.auajournals.org/doi/10.1016/j.juro.2015.06.081