1 Harvard Medical School, Boston, MA, USA. Electronic address: adam_beckman@hms.harvard.edu.
2 MIT Computer Science and Artificial Intelligence Laboratory, Cambridge, MA, USA.
3 Ariadne Labs at Brigham and Women's Hospital and the Harvard T.H. Chan School of Public Health, Boston, MA, USA; Beth Israel Deaconess Medical Center, Department of Obstetrics and Gynecology, Boston, MA, USA.