Name Info Provider Link
subscription/membership/fee required Ovid Technologies, Inc. http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=30431593.ui
free resource PubMed Central https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/30431593/
free resource Europe PubMed Central https://europepmc.org/abstract/MED/30431593
free resource Wolters Kluwer https://doi.org/10.1097/MD.0000000000013179