RT Journal Article SR Electronic T1 Varenicline may reduce negative effect while aiding smoking cessation JF Evidence Based Medicine JO Evid Based Med FD BMJ Publishing Group Ltd SP 23 OP 23 DO 10.1136/eb-2013-101435 VO 19 IS 1 A1 J Taylor Hays YR 2014 UL http://ebm.bmj.com/content/19/1/23.abstract AB