Name Info Provider Link
subscription/membership/fee required Ovid Technologies, Inc. http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=20839217.ui
free resource PubMed Central https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/20839217/
free resource Europe PubMed Central https://europepmc.org/abstract/MED/20839217
subscription/membership/fee required Wiley https://doi.org/10.1002/em.20581