About the Authors

David Van Sickle

dvansickle@gmail.com

Affiliation Department of Population Health Sciences, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin, United States of America

Sheryl Magzamen

Affiliation Department of Population Health Sciences, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin, United States of America

Shaun Truelove

Affiliation Department of Population Health Sciences, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin, United States of America

Teresa Morrison

Affiliation Air Pollution and Respiratory Health Branch, National Center for Environmental Health, Centers for Disease Control and Prevention, Atlanta, Georgia, United States of America

Competing Interests

The authors have read the journal's policy and have the following conflicts to report: DVS is a shareholder and officer in a company (Reciprocal Labs Corporation) that is developing an electronic inhaler sensor for commercial use. The company did not participate in this research study or finance this manuscript in any way. This does not alter the authors' adherence to all the PLOS ONE policies on sharing data and materials. The other authors declare that no competing interests exist.

Author Contributions

Conceived and designed the experiments: DVS SM TM. Performed the experiments: DVS ST. Analyzed the data: DVS SM. Wrote the paper: DVS SM ST TM.