Author contributions: SV and MK: wrote the manuscript; NI and MP: designed the study; MK, VM and EI: performed the sample collection and analysis; RS, NI: supervised sample collection; SV and MP: supervised the sample analysis; MB and AP: performed the statistical analysis; RS, ZI, RC, TB, NI, MP: critically revised the manuscript. All authors have accepted responsibility for the entire content of the submitted manuscript and approved submission.
Research funding: None declared.
Employment or leadership: None declared.
Honorarium: None declared.
Competing interests: The funding organization(s) played no role in the study design; in the collection, analysis, and interpretation of data; in the writing of the report; or in the decision to submit the report for publication.
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