Journal of General Internal Medicine: 2008 Mar 7
Conclusions: “Accessing free prescription drug samples is prevalent among many categories of beneficiaries, especially among individuals with cost-related medication nonadherence and poor health status. Policies restricting or prohibiting drug sample distribution may adversely impact access to medications among patients in high-risk groups.”
http://www.ncbi.nlm.nih.gov/pubmed/18365289

also found at:
http://www.springerlink.com/content/9871685172880q62/;
http://lib.bioinfo.pl/auth:Tjia,J;