About the Authors
- Jacco Wallinga, Janneke C. M Heijne, Mirjam Kretzschmar
- Centre for Infectious Disease Epidemiology, National Institute for Public Health and the Environment, Bilthoven, the Netherlands
The authors have declared that no competing interests exist.
JW designed the study. JW and JCMH collected and analyzed the data. JW, JCMH, and MK contributed to writing the paper.