http://ehp.sagepub.com Evaluation & the Health Professions DOI: 10.1177/0163278703026002003 2003; 26; 166 Eval Health Prof Zelda Di Blasi and Jos Kleijnen Context Effects: Powerful Therapies or Methodological Bias? http://ehp.sagepub.com/cgi/content/abstract/26/2/166 The online version of this article can be found at: Published by: http://www.sagepublications.com can be found at: Evaluation & the Health Professions Additional services and information for http://ehp.sagepub.com/cgi/alerts Email Alerts: http://ehp.sagepub.com/subscriptions Subscriptions: http://www.sagepub.com/journalsReprints.nav Reprints: http://www.sagepub.com/journalsPermissions.nav Permissions: http://ehp.sagepub.com/cgi/content/refs/26/2/166 Citations at University College on April 21, 2009 http://ehp.sagepub.com Downloaded from