1. Department of Psychiatry, University of Utah School of Medicine, Salt Lake City, UT
2. Department of Psychiatry, Virginia Commonwealth University School of Medicine, Richmond, VA
3. Virginia Institute for Psychiatric and Behavioral Genetics, Richmond, VA
4. Department of Sociology, University of Utah, Salt Lake City, UT
5. Department of Psychology, University of Minnesota, Minneapolis, MN
6. MRC Institute of Genetics and Molecular Medicine, University of Edinburgh, Edinburgh, UK
7. Division of Psychiatry, University of Edinburgh, Edinburgh, UK