About the Authors

Cheryl Chriss Sawyer
Population Division, Department of Economic and Social Affairs, United Nations, New York, New York, United States of America

Corresponding Author

sawyerc@un.org

Competing Interests

The author has declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: CCS. Performed the experiments: CCS. Analyzed the data: CCS. Wrote the first draft of the manuscript: CCS. Contributed to the writing of the manuscript: CCS. ICMJE criteria for authorship read and met: CCS. Agree with manuscript results and conclusions: CCS.