The health risks and benefits of cycling in urban environments compared with car use: health impact assessment study. BMJ 2011; 343:d4521 doi: 10.1136/bmj.d4521 (Published 4 August 2011)
The health risks and benefits of cycling in urban environments compared with car use: health impact assessment study. BMJ 2011; 343:d4521 doi: 10.1136/bmj.d4521 (Published 4 August 2011)
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