Retraction Note: BMC Infectious Diseases (2020) 20:949
10.1186/s12879-020-05630-2
The Editor has retracted this article because the authors have been unable to provide documents confirming that ethics approval was obtained for the study. None of the authors have responded to correspondence from the Editor about this retraction.
Footnotes
The online version of the original article can be found at 10.1186/s12879-020-05630-2.
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