We found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleValidity of indirect comparison for estimating efficacy of competing interventions: empirical evidence from published meta-analysesAuthorsSong, F.PublicationBMJ, 2003, Vol 326, Issue 7387, p472ISSN0959-8138Publication typearticleDOI10.1136/bmj.326.7387.472