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http://dx.doi.org/10.1016/j.amepre.2004.10.024DOI Link
http://www.sciencedirect.com/science/article/pii/S[...]01/12/2015Item is within a limited-access website
http://www.ajpmonline.org/article/S0749-3797(04)00[...]01/12/2015PDF ReaderItem is within a limited-access website