Received: 16 July 2020
Accepted: 21 July 2020
First Online: 23 July 2020
Ethics approval and consent to participate
: The study was conducted according to the ethical requirements established by the Declaration of Helsinki. The local Ethics Committee of <i>Hannover Medical School</i> (MHH) and Hamburg Medical Association at the <i>University Medical-Center Hamburg-Eppendorf</i> (UKE) approved the study (ethic consent number 9042_BO_K_2020 and PV7298, respectively). Written consent from all people were collected before sample collection.
: Not applicable.
: The authors declare that they have no competing interests.