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Kahlmeier, Sonja; Cavill, Nick; Dinsdale, Hywell; Rutter, Harry; Götschi, Thomas; Foster, Charlie; Kelly, Paul; Clarke, Dushy; Oja, Pekka; Fordham, Richard; Stone, David; Racioppi, Francesca (2011). Health economic assessment tools (HEAT) for walking and for cycling. Methodology and user guide. Economic assessment of transport infrastructure and policies. Copenhagen, DK: World Health Organization.