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http://dx.doi.org/10.1016/j.amepre.2008.07.006DOI Link
http://www.ajpm-online.net/article/PIIS07493797080[...]01/16/2009Item is within a limited-access website
http://www.ajpmonline.org/article/S0749-3797(08)00[...]03/25/2015PDF ReaderItem is within a limited-access website