Figure 1.

Study design. *Phases 1, 2 and 3 (from April 2007 to September 2008) are a consequence of our previous publication [4]. We extended data collection in this present manuscript (from October 2008 to December 2010) in phase 3.

Caserta et al. BMC Infectious Diseases 2012 12:234   doi:10.1186/1471-2334-12-234
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