Name Info Provider Link
subscription/membership/fee required American Psychological Association http://content.apa.org/journals/com/124/4/356
subscription/membership/fee required Ovid Technologies, Inc. http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=20836592.ui
free resource PubMed Central https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/20836592/
free resource Europe PubMed Central https://europepmc.org/abstract/MED/20836592