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Authors
Sperle, Ida
Nielsen, Stine
Gassowski, Martyna
Naneva, Zlatina
Perchemlieva, Tanya
Amato-Gauci, Andrew
an der Heiden, Matthias
Bremer, Viviane
Golkocheva-Markova, Elitsa
Hristov, Kristiyan
Kaneva, Elena
Simeonova, Yanita
Tenev, Tencho
Varleva, Tonka
Duffell, Erika
Zimmermann, Ruth
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Funding
Funding for this research was provided by:
European Centre for Disease Prevention and Control
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Article History
Received: 21 January 2020
Accepted: 26 June 2020
First Online: 7 July 2020
Ethics approval and consent to participate
: Ethics approval was received from the local ethics committee in Stara Zagora, Bulgaria. Written informed consent was collected from all participants prior to participation in the study.
: Not applicable.
: The authors declare that they have no competing interests.
