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doi: 10.1093/ije/dyu214 Advance Access Publication Date: 31 October 2014 Authors’ response to: Cohort effects explain the increase in autism diagnosis: an identifiability problem of the age-period-cohort model From Katherine M Keyes, Ezra Susser, Keely Cheslack-Postava, Christine Fountain, Kayuet Liu and Peter S Bearman* Department of Epidemiology, Columbia University, New York, New York State Psychiatric Institute and Paul F. Lazarsfeld Center for the Social Sciences, Columbia University, New York