Name Info Provider Link
subscription/membership/fee required Ovid Technologies, Inc. http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=11685028.ui
free resource PubMed Central https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/11685028/
subscription/membership/fee required Wolters Kluwer https://journals.lww.com/11685028.pmid