Mark J Daly1. 1. Analytic and Translational Genetics Unit, Department of Medicine, Massachusetts General Hospital, Boston, MA 02114, USA; Program in Medical and Population Genetics and Stanley Center for Psychiatric Research, Broad Institute of Harvard and MIT, Cambridge, MA 02142, USA; Harvard Medical School, Boston, MA 02115, USA; Institute for Molecular Medicine Finland, University of Helsinki, 00014 Helsinki, Finland. Electronic address: mjdaly@atgu.mgh.harvard.edu.