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\bibitem{Janssen_etal2005} {\textquotedblleft}\textit{Associations between ambient, personal, and indoor exposure to fine particulate matter constituents in Dutch and Finnish panels of cardiovascular patients}{\textquotedblright}. Janssen NAH, Lanki T, Hoek G, Vallius M, de Hartog JJ, Van Grieken R, Pekkanen J, Brunekreef B, Occupational and environmental medicine \textbf{62}, 868 (2005).   http://doi.org/10.1136/OEM.2004.016618

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