1. Center for the Study of Aging and Human Development, Box 3003, Duke University Medical Center, Durham, NC and the Geriatrics Research Education and Clinical Center, Durham VA Medical Center, Durham NC, USA
2. Duke Clinical Research Institute, Durham, NC, USA
3. Novartis Pharmaceuticals Corporation, East Hanover, NJ, USA
4. Department of Epidemiology and Preventive Medicine, University of Maryland School of Medicine, Baltimore, MD, USA
5. McMaster University, Hamilton, Ontario, Canada
6. Savient Pharmaceuticals, Inc. East Brunswick, NJ, USA