1. Department of Clinical Biochemistry, Royal Prince Alfred Hospital, Camperdown NSW 2050, Australia, and University of Sydney, Sydney NSW 2006, Australia
2. The Queensland Institute of Medical Research and the Joint Genetics Program, University of Queensland, Brisbane QLD 4029, Australia
3. Division of Endocrinology, Medical College of Virginia, Richmond, VA 23398
4. Department of Psychiatry, Washington University School of Medicine, St. Louis, MO 63108