Secondhand smoke exposure assessed using serum cotinine: associations with myocardial infarction, stroke and cardiovascular risk factors in adult men and women. (9th September 2009) - Jefferis, B. J.; Lowe, G. D. O.; Welsh, P.; Lawlor, D. A.; Ebrahim, S.; Wannamethee, S. G.; Cook, D. G.; Whincup, P. H.