About the Authors
- Charles Preston
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* E-mail: charles.preston@fda.hhs.gov
Affiliation Office of International Programs, US Food and Drug Administration (FDA), Silver Spring, Maryland, United States of America
- Mary Lou Valdez
- Katherine Bond
Competing Interests
The authors have declared that no competing interests exist.
Author Contributions
Wrote the first draft of the manuscript: CP. Contributed to the writing of the manuscript: CP KB LV. ICMJE criteria for authorship read and met: CP KB LV. Agree with manuscript results and conclusions: CP KB LV.