Received: 9 December 2020
Accepted: 14 July 2021
First Online: 22 July 2021
: The study protocol was approved by the institutional research commission of the Swiss Tropical and Public Health Institute (Swiss TPH, Basel, Switzerland; reference no. FK 120; approval date: June 24, 2015) and the ethics committee of Northwest and Central Switzerland (reference no. EKNZ 2015-353; approval date: November 20, 2015). A written informed consent was collected from all voluntary participants of the study.
: Not applicable.
: No conflict of interest was declared by all authors.