Funding for this research was provided by:
School of Advanced Studies University of Camerino
University of Camerino
Internationalization grants University of Camerino
Public Health Laboratory Ivo de Carneri
Received: 27 June 2020
Accepted: 5 January 2021
First Online: 19 January 2021
Ethics approval and consent to participate
: The project was approved by the Zanzibar Medical Ethical Research Committee under the protocol number ZAMREC/001/SEPT/018.
: Not applicable.
: The authors declare that they have no competing interests.