1. VA Boston Healthcare System, Harvard Medical School, West Roxbury, MA, USA
2. Hebrew SeniorLife, Institute for Aging Research, Roslindale, MA, USA
3. Department of Medicine, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA, USA
4. Massachusetts Veterans Epidemiology Research and Information Center (MAVERIC), VA Boston Healthcare System, Boston, MA, USA
5. Clinic for Cardiovascular Surgery, University Hospital of Zurich, Zurich, Switzerland
6. Division of Aging, Brigham and Women’s Hospital, Boston, MA, USA
7. Department of Biostatistics, Boston University School of Public Health, Boston, MA, USA