1. Salini Mohanty, Alison M. Buttenheim, and Caroline M. Joyce are with the University of Pennsylvania, School of Nursing, Philadelphia. Alison M. Buttenheim is also with the Center for Health Incentives and Behavioral Economics, Perelman School of Medicine of the University of Pennsylvania. Amanda C. Howa and Saad B. Omer are with Emory University, Rollins School of Public Health, Atlanta, GA. Daniel Salmon is with Johns Hopkins University, Bloomberg School of Public Health, Baltimore, MD.