1 Channing Division of Network Medicine, Brigham and Women's Hospital and Harvard Medical School, and Department of Epidemiology, Harvard T.H. Chan School of Public Health, 181 Longwood Ave., 3rd Floor, Boston, MA, 02115, USA.
2 Department of Population Health Sciences, Huntsman Cancer Institute, University of Utah, 2000 Circle of Hope, Rm 4125, Salt Lake City, UT, 84112-5550, USA. jen.doherty@hci.utah.edu.