1. Institute of Environmental Medicine Karolinska Institutet Solna Sweden
2. Department of Medical Epidemiology and Biostatistics Karolinska Institutet Solna Sweden
3. Center of Public Health Sciences University of Iceland Reykjavik Iceland
4. Department of Epidemiology Harvard T. H. Chan School of Public Health Boston Massachusetts USA
5. Department of Psychiatry University of North Carolina Chapel Hill North Carolina USA
6. Department of Genetics University of North Carolina Chapel Hill North Carolina USA