About the Authors

J. Ties Boerma

boermat@who.int

Affiliation World Health Organization, Geneva, Switzerland

Colin Mathers

Affiliation World Health Organization, Geneva, Switzerland

Carla Abou-Zahr

Affiliation Geneva, Switzerland

Competing Interests

While working at WHO, CAZ was involved in the development of global estimates. Disclaimer: The authors are staff members of the World Health Organization. The authors alone are responsible for the views expressed in this publication, and they do not necessarily represent the decisions or policies of the World Health Organization.

Author Contributions

ICMJE criteria for authorship read and met: JTB CM CAZ. Wrote the first draft of the paper: JTB. Contributed to the writing of the paper: CM CAZ.