RT Journal Article SR Electronic T1 Internet-based interventions for smoking cessation show inconsistent effects across trials, with only some trials showing a benefit JF Evidence Based Nursing JO Evid Based Nurs FD BMJ Publishing Group Ltd and RCN Publishing Company Ltd SP 47 OP 48 DO 10.1136/ebn1135 VO 14 IS 2 A1 Carla J Berg YR 2011 UL http://ebn.bmj.com/content/14/2/47.abstract AB