1. University of Pittsburgh Departments of Medicine & Public Health; Pittsburgh Pennsylvania USA
2. University of Pittsburgh Department of Neurosurgery; Pittsburgh Pennsylvania USA
3. The Memorial Hospital of Rhode Island; Pawtucket Rhode Island USA
4. Department of Public Health Sciences; University of California-Davis; Davis California USA
5. Department of Preventive Medicine; University of Tennessee Health Science Center; Memphis Tennessee USA
6. Division of Preventive Medicine; University of Alabama at Birmingham; Birmingham Alabama USA
7. David Geffen School of Medicine at the University of California-Los Angeles; Los Angeles California USA
8. University of Pittsburgh Graduate School of Public Health; Pittsburgh Pennsylvania USA
9. University of Iowa College of Public Health; Iowa City Iowa USA
10. Division of Preventive and Behavioral Medicine; University of Massachusetts Medical School; Worcester Massachusetts USA