Key points are not available for this paper at this time.
The authors have declared that no competing interests exist. This work was conducted with support from the Bill & Melinda Gates Foundation Collaboration for AIDS Vaccine Discovery (www.cavd.org) and the Grand Challenges in Global Health Initiative (www.grandchallenges.org). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.
Klein et al. (2010) studied this question.
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