Acknowledgments
This work was supported by the US Centers for Disease Control and
Prevention (Cooperative Agreement 1 U01 CK000337-01 to DATC), and the
Engineering and Physical Sciences Research Council (grant EP/N014499/1
to JMR). We would like to thank the Allegheny County Department of
Health (Dr. Luanne Brink and Steve Forest) for providing their data; and
the schools, staff, students, and parents who participated in PIPP,
SMART, and SMART2. We also thank Rahaan Gangat of the
National Weather Service Pittsburgh for his assistance with climate
data. We thank Scott Zeger for helpful discussions regarding analyses.