%0 Journal Article %A J-F. Etter %A C. Bullen %T Saliva cotinine levels in users of electronic cigarettes %D 2011 %R 10.1183/09031936.00066011 %J European Respiratory Journal %P 1219-1220 %V 38 %N 5 %U https://erj.ersjournals.com/content/erj/38/5/1219.full.pdf