1. Harvard T.H. Chan School of Public Health, Boston, MA 02115, USA
2. Boston Children’s Hospital, Boston, MA 02115, USA
3. Heller School for Social Policy & Management, Brandeis University, Waltham, MA 02453, USA
4. Charles R. Drew, UCLA Medical Education Program, Los Angeles, CA 90059, USA
5. UCLA David Geffen School of Medicine, Los Angeles, CA 90095, USA
6. Beth Israel Deaconess Medical Center, Boston, MA 02215, USA