From the aDepartment of Environmental Health, bDepartment of Epidemiology, cDepartment of Biostatistics, Harvard T.H. Chan School of Public Health, Boston, MA; and dFaculty of Medicine, Braun School of Public Health & Community Medicine, Hebrew University-Hadassah, Jerusalem, Israel.
Some of the work on which this manuscript was based was funded by a grant to MW from the US Department of Defense (W81XWH-08-1-0499). Additional funding was received from Mr. James Crystal in honor of Mrs. Lillian Yaros.
The authors report no conflicts of interest.
Correspondence: Marc G. Weisskopf, Departments of Environmental Health and Epidemiology, Harvard T.H. Chan School of Public Health, Landmark Center, 401 Park Dr., P.O. Box 15677, Boston, MA 02215. E-mail: email@example.com.