| Jack M Guralnik | 4 Department of Epidemiology University of Maryland Baltimore MD. |
| Luigi Ferrucci | 5 Division of Intramural Research National Institute on Aging Baltimore MD. |
| Luigi Ferrucci | 5 Division of Intramural Research National Institute on Aging Baltimore MD. |
| Lu Tian | 6 Department of Health Research and Policy Stanford University Palo Alto CA. |
| Lihui Zhao | Department of Preventive Medicine Northwestern University Feinberg School of Medicine Chicago IL. |
| Jack M Guralnik | 8 University of California San Diego La Jolla CA. |