1 Medical Research Council Integrative Epidemiology Unit, Department of Population Health Sciences, Bristol Medical School, University of Bristol, Bristol, BS8 2BN, UK. g.hemani@bristol.ac.uk.
2 Department of Clinical Biochemistry, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark.
3 Department of Epidemiology, Erasmus MC University Medical Center, Rotterdam, The Netherlands.
4 Department of Epidemiology, Harvard T.H. Chan School of Public Health, Boston, USA.
5 Medical Research Council Integrative Epidemiology Unit, Department of Population Health Sciences, Bristol Medical School, University of Bristol, Bristol, BS8 2BN, UK.