1. Researcher, RTI International, Washington, District of Columbia, USA
2. Professor, Department of Public Health Sciences, University of Rochester School of Medicine and Dentistry, Rochester, New York, USA
3. Director, Geriatrics & Extended Care Data Analysis Center, Canandaigua VA Medical Center, Canandaigua, New York, USA
4. Professor, Department of Medicine, University of California, Irvine, Irvine, California, USA
5. Associate Professor, Department of Public Health Sciences, University of Rochester School of Medicine and Dentistry, Rochester, New York, USA