Name	Info	Provider	Link
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/30588787/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/30588787
	free resource	Korean Society for Sexual Medicine and Andrology	https://wjmh.org/DOIx.php?id=10.5534/wjmh.180082