1. David Geffen School of Medicine at UCLA, Los Angeles, California.
2. eHarmony.com, Pasadena, California.
3. Department of Preventive Medicine, Rush University Medical Center, Chicago, Illinois.
4. Wake Forest University School of Medicine, Department of Public Health Sciences, Winston-Salem, North Carolina.
5. Division of Research, Kaiser Permanente, Oakland, California.
6. Department of Epidemiology, University of Pittsburgh, Pittsburgh, Pennsylvania.