We found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleSumming up evidence: one answer is not always enough.AuthorsLau J; Ioannidis JPA; Schmid CHPublicationLancet, 1998, Vol 351, Issue 9096, p123ISSN0140-6736Publication typearticleDOI10.1016/s0140-6736(97)08468-7