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Kahlmeier, Sonja; Götschi, Thomas; Cavill, Nick; Castro Fernandez, Alberto; Brand, Christian; Rojas Rueda, David; Woodcock, James; Kelly, Paul; Lieb, Christoph; Oja, Pekka; Foster, Charlie; Rutter, Harry; Racioppi, Francesca (2017). Health economic assessment tool (HEAT) for walking and for cycling. methods and user guide on physical activity, air pollution, injuries and carbon impact assessments. Copenhagen: World Health Organization, Regional Office for Europe.