1. Section of Cardiovascular Medicine, Yale School of Medicine, New Haven, Connecticut, USA.
2. Program for Biomedical Ethics, Yale School of Medicine, New Haven, Connecticut, USA.
3. Division of Cardiovascular Medicine, University of Colorado School of Medicine, Aurora, Colorado, USA.
4. Division of Maternal-Fetal Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USA.
5. Division of Hematology, Oncology, and Transplantation, University of Minnesota Medical School, Minneapolis, Minnesota, USA.
6. Department of Surgery, University of California San Francisco School of Medicine, San Francisco, California, USA.