About the Authors

Richard A. Gray

Richard.Gray@fda.hhs.gov

Affiliation Division of Biomedical Physics, Office of Science and Engineering Laboratories, Center for Devices and Radiological Health, Food and Drug Administration, Silver Spring, Maryland, United States of America

Pras Pathmanathan

Affiliation Division of Biomedical Physics, Office of Science and Engineering Laboratories, Center for Devices and Radiological Health, Food and Drug Administration, Silver Spring, Maryland, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceptualization: RAG. Formal analysis: RAG PP. Investigation: RAG. Methodology: RAG. Software: RAG. Validation: RAG PP. Visualization: RAG. Writing – original draft: RAG. Writing – review & editing: RAG PP.