RT Journal Article SR Electronic T1 Electronic nicotine delivery systems JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP 858 OP 859 DO 10.1183/09031936.00214614 VO 45 IS 3 A1 Francesco Blasi A1 Brian Ward YR 2015 UL http://erj.ersjournals.com/content/45/3/858.2.abstract AB