Funding for this research was provided by:
Region of Southern Denmark
Fonden til Lægevidenskabens Fremme
Knud og Edith Eriksens Mindefond
Received: 3 February 2021
Accepted: 26 April 2021
First Online: 29 May 2021
: The study was approved by the Regional Committees on Health Research Ethics for Southern Denmark (S-20170049) and the Danish Data Protection Agency (file 18/28928). All participants provided informed consent for blood sampling and storage of information obtained from the questionnaire and serological analysis.
: All participants provided consent for publication of all the obtained results.
: The authors declare no conflicts of interest.