Received: 19 March 2021
Accepted: 18 June 2021
First Online: 12 July 2021
: The study was approved by the Medical Ethics Committees in all participating cities and funded by the European Commission Executive Agency for Health and Consumers. Written informed consent was obtained from all participants [CitationRef removed]. The study was registered in the ISRCTN registry as ISRCTN52788952. All methods were carried out in accordance with relevant guidelines and regulations.
: Not applicable.
: The authors declare that they have no competing interests.