1. Roger C. Lipitz Center for Integrated Health Care, Department of Health Policy and Management, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA
2. MedStar Health Institute for Quality and Safety, MedStar Health System, Columbia, MD, USA
3. Johns Hopkins Community Physicians, Baltimore, MD, USA
4. Department of Health, Behavior, and Society, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA