1. Master of Arts in Bioethics Program, Center for Ethics, Emory University, Atlanta, GA, USA
2. Department of Medicine, School of Medicine, Emory University, Atlanta, GA, USA
3. Department of Health Management and Policy, University of Iowa, Iowa City, IA, USA
4. Section of Geriatrics, Department of Internal Medicine, College of Medicine, University of Nebraska Medical Center, Omaha, NE, USA