Name	Info	Provider	Link
	free resource	Atypon	https://journals.sagepub.com/doi/abs/10.4103/IJPSYM.IJPSYM_58_19?url_ver=Z39.88-2003&rfr_id=ori:rid:crossref.org&rfr_dat=cr_pub 0pubmed
	subscription/membership/fee required	Ovid Technologies, Inc.	http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=31548777.ui
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/31548777/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/31548777