Interview with Carla M. Perissinotto, MD, MHS, author of Loneliness in Older Persons: A Predictor of Functional Decline and Death, Jacob A. Udell, MD, MPH, author of Living Alone and Cardiovascular Risk in Outpatients at Risk of or With Atherothrombosis, and Emily M. Bucholz, MPH, author of Loneliness and Living Alone: What Are We Really Measuring?: Comment on "Loneliness in Older Persons" and "Living Alone and Cardiovascular Risk in Outpatients at Risk of or With Atherothrombosis"