About the Authors

Nolan Caldwell

Affiliation Department of Emergency Medicine, Stanford University, Stanford, California, United States of America

Tanja Srebotnjak

Affiliation Ecologic Institute, San Mateo, California, United States of America

Tiffany Wang

Affiliation University of Minnesota Medical School, Twin Cities, Minnesota, United States of America

Renee Hsia

Renee.hsia@emergency.ucsf.edu

Affiliation Department of Emergency Medicine, University of California San Francisco, San Francisco, California, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: NC TW TS RYH. Performed the experiments: TS RYH. Analyzed the data: TS NC RYH. Contributed reagents/materials/analysis tools: RYH. Wrote the paper: NC TW RYH TS.