RT Journal Article SR Electronic T1 Electronic cigarettes are at least as effective as nicotine patches for smoking cessation JF Evidence Based Medicine JO Evid Based Med FD BMJ Publishing Group Ltd SP 133 OP 133 DO 10.1136/eb-2013-101690 VO 19 IS 4 A1 Lion Shahab A1 Maciej Goniewicz YR 2014 UL http://ebm.bmj.com/content/19/4/133.abstract AB