systematic review meta-analysis National Center for Biotechnology Information NCBI NLM MEDLINE therapy review humans pubmed abstract nih national institutes of health national library of medicine treatment outcome research support non-u.s. gov't female male randomized controlled trials as topic pmid:19832783 doi:10.1111/j.1360-0443.2009.02710.x lion shahab andy mcewen intention internet* outcome assessment health care / statistics & numerical data* pamphlets patient acceptance of health care / statistics & numerical data patient education as topic / methods self care / methods self care / statistics & numerical data smoking / therapy* smoking cessation / methods* smoking cessation / psychology smoking cessation / statistics & numerical data computer-assisted / methods*