1. Department of Public Health Sciences, Wake Forest School of Medicine, Winston-Salem, North Carolina
2. Department of Preventive Medicine and Biometrics, University of Colorado, Health Science Center, Denver, Colorado
3. Division of Research, Kaiser Permanente, Oakland, California
4. Department of Medicine, University of Kuopio, Kuopio, Finland
5. Department of Medicine, University of Texas Health Sciences Center at San Antonio, San Antonio, Texas