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Correspondence to Anna Hidle (email: ahidle@cdc.gov)
We thank Raymond Hutubessy, Siobhan Botwright, Monica Mbawa, Marian Fadzi, Taurai Chikutye, Clara Mashiringo and Sikhanyiso Mbengano.
Competing interests: None declared.
This work was supported by Gavi, The Vaccine Alliance and the United States Centers for Disease Control and Prevention from contract number 200-2015-63464-0001
© 2018, World Health Organization. All rights reserved.