Back to matchesWe found a matchYour institution may have rights to this item. Sign in to continue.TitlePetersen et al. Respond to "Effect Modification by Time-varying Covariates".AuthorsMaya L. Petersen; Mark J. van der LaanPublicationAmerican Journal of Epidemiology, 2007, Vol 166, Issue 9, p1003ISSN0002-9262Publication typeArticleDOI10.1093/aje/kwm230