Economic assessment of transport infrastructure and policies : health economic assessment tools (HEAT) for walking and for cycling : methodology and user guide - Kahlmeier, Sonja; Cavill, Nick; Dinsdale, Hywell; Rutter, Harry; Götschi, Thomas; Foster, Charlie; Kelly, Paul; Clarke, Dushy; Oja, Pekka; Fordham, Richard; Stone, Dave; Racioppi, Francesca (WHO Regional Office for Europe, 2011)