Detecting and correcting for bias in Mendelian randomization analyses using gene-by-environment interactions Wes Spiller, David Slichter, Jack Bowden and George Davey Smith equal supervisory contribution 1 School of Social and Community Medicine, University of Bristol, Barley House, Oakfield Grove, Bristol, BS8 2BN, U.K 2 Department of Economics, Binghamton University, State University of New Y...