- Correspondence to Marjolein J Korndewal, Center for Infectious Diseases, Epidemiology and Surveillance, National Institute for Public Health and the Environment (RIVM), Bilthoven, BA 3720, The Netherlands; , ,
- Received January 31, 2017
- Revised November 26, 2017
- Accepted November 27, 2017
- First published January 23, 2018.
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