Exposure to secondhand smoke and cognitive impairment in non-smokers : national cross sectional study with cotinine measurement

Langa, Kenneth M; Llewellyn, David J; Iang, Lain A; Naughton, Felix; Matthews, Fiona E. (2009). Exposure to secondhand smoke and cognitive impairment in non-smokers : national cross sectional study with cotinine measurement. British medical journal. 338(7695), 632-634.