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Sheila C Dollard, Email:sgd5@cdc.gov
SD contributed to study design and data analysis, supervised lab work, and was lead writer on paper.
HK contributed to study design, facilitated involvement of the clinic facilities and staff, and analysis.
KR contributed to study design, specimen transport, and laboratory testing.
JS contributed to statistical analysis and manuscript preparation.
MA contributed to study design, specimen transport, and laboratory testing.
JW contributed to study design, specimen transport, and laboratory testing.
SS contributed to study design and financial support.
MC contributed to design, financial support, statistical analysis, manuscript preparation.
TH contributed to study design, study protocol, IRB approval, analysis, manuscript preparation.
All authors read and approved the final manuscript.
The authors would like to thank the parents of the children in this study.
The authors declare that they have no competing interests.
Funding was provided by the Centers for Disease Control and Prevention.
© Dollard et al.; licensee BioMed Central Ltd. 2014