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Kahlmeier, Sonja; Kelly, Paul; Foster, Charlie; Götschi, Thomas; Cavill, Nick; Dinsdale, Hywell; Woodcock, James; Schweizer, Christian; Rutter, Harry; Lieb, Christoph; Pekka, Oja; Racioppi, Francesca (2014). Health economic assessment tools (HEAT) for walking and for cycling : methodology and user guide : economic assessment of transport infrastructure and policies : 2014 update. Copenhagen: World Health Organization.