1. Birmingham/Atlanta Geriatric Research, Education and Clinical Center, Department of Veterans Affairs Medical Center, University of Alabama at Birmingham, Birmingham, Alabama
2. School of Medicine, University of Alabama at Birmingham, Birmingham, Alabama
3. Center for Aging, University of Alabama at Birmingham, Birmingham, Alabama
4. School of Public Health, University of Alabama at Birmingham, Birmingham, Alabama
5. National Center for Health Statistics, Centers for Disease Control and Prevention, Hyattsville, Maryland