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@Chalfie
Can you not access the link?IT is it one of those paywalled journals?The study’s eligibility criteria were; aged 18 to 40 yr, regularly commuting to work in
either the east-end of London, or in central London for a least 3 yr, no history of
personal smoking or domestic second-hand smoke exposure within the last 3 yr, and
no acute or chronic medical conditions. Exclusion criteria were; clinical respiratory
infection within the previous 3 months, use of candles, wood, open fires in the home,
and commuting to work by car. Car drivers were excluded since the majority of
Londoners do not drive to work. Subjects were classified as cyclists if they habitually
cycled from home to work. Non-cyclists were classified as individuals who
commuted to work by either walking or public transport, or a combination of both.
Subjects were studied November 2010 through March 2011. The local research ethics
committee approved this study, and all subjects provided written consent.