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Hepatitis B vaccination timing: results from demographic health surveys in 47 countries
A. Schweitzer et al., Bulletin of the World Health Organization, Jan. 2017
Excerpt below; full text is at http://www.who.int/bulletin/volumes/95/3/16-178822/en/
“The substantial inequities in the implementation and adherence to national immunization schedules for hepatitis B vaccine underscore the continued need for strengthening immunization systems.”