National Survey of Volunteer Pharmacy Preceptors: Effects of Region, Practice Setting, and Population Density on ResponsesPharmacy Practice 2010; 23; 265 originally published online Apr 14, 2010;
Hritcko, Cynthia J. Boyle, Mitra Assemi and Paul D. Turner
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http://jpp.sagepub.com/cgi/content/abstract/23/3/265