1. Stanford University School of Medicine, Department of Psychiatry and Behavioral Sciences, Palo Alto, CA 94305, USA
2. University of Iowa Carver College of Medicine, Department of Psychiatry, Iowa City, IA 52242, USA
3. Tottori University Faculty of Medicine, Department of Neuropsychiatry, Yonago-Shi, Tottori, Japan
4. University of Iowa Carver College of Medicine, Department of Emergency Medicine, Iowa City, IA 52242, USA
5. University of Iowa College of Public Health, Department of Biostatistics, Iowa City, IA 52242, USA
6. University of Iowa Carver College of Medicine, Department of Internal Medicine, Iowa City, IA 52242, USA