The Authors Respond.
Department of Epidemiology, School of Public Health, University of North Carolina at Chapel Hill, Chapel Hill, NC, david.richardson@unc.edu Department of Biostatistics, Harvard University, Boston, MA National Center for Environmental Assessment, US Environmental Protection Agency, Washington, DC.
David B
DB
Richardson
Alexander P
AP
Keil
Eric J
EJ
Tchetgen Tchetgen
Glinda S
GS
Cooper