Name Info Provider Link
subscription/membership/fee required Atypon https://www.ajph.org/doi/10.2105/AJPH.2013.301752?url_ver=Z39.88-2003&rfr_id=ori:rid:crossref.org&rfr_dat=cr_pub 0pubmed
subscription/membership/fee required Ovid Technologies, Inc. http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=24625144.ui
free resource PubMed Central https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/24625144/