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. 2014 Jun 25;9(6):e100651. doi: 10.1371/journal.pone.0100651

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© 2014 Stoof et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Flow chart for recruitment, enrolment and loss to follow-up. Participants were recruited in September 2011 from the surrounding area of Utrecht, The Netherlands. At the beginning of the study (T0) all participants received one booster vaccination with the Meningococcal serogroup C polysaccharide conjugated to tetanus toxoid vaccine (MenC-TT, Baxter); T1 and T2 indicate 1 month and 1 year after the MenC-TT booster respectively. *83 potential participants were excluded because the enrolment target of the study had been achieved.