Name Info Provider Link
subscription/membership/fee required Ovid Technologies, Inc. http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=19878433.ui
free resource PubMed Central https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/19878433/
free resource Europe PubMed Central https://europepmc.org/abstract/MED/19878433
free resource Wiley https://onlinelibrary.wiley.com/doi/10.1111/j.1471-4159.2009.06460.x