RT Journal Article SR Electronic T1 Varenicline and combination nicotine replacement therapy are the most effective pharmacotherapies for treating tobacco use JF Evidence Based Medicine JO Evid Based Med FD BMJ Publishing Group Ltd SP 212 OP 213 DO 10.1136/eb-2013-101462 VO 18 IS 6 A1 Ebbert, Jon O YR 2013 UL http://ebm.bmj.com/content/18/6/212.abstract AB