1. Michael Siegel, Molly Pahn, Ziming Xuan, Craig S. Ross, and Sandro Galea are with the Boston University School of Public Health, Boston, MA. Bindu Kalesan is with the Boston University School of Medicine. Eric Fleegler is with the Department of Emergency Medicine, Children’s Hospital Boston. Kristin A. Goss is with the Sanford School of Public Policy, Duke University, Durham, NC.