Funding for this research was provided by:
This study was supported by the Apulian Regional Observatory for Epidemiology
Received: 3 January 2020
Accepted: 25 May 2020
First Online: 1 June 2020
Ethics approval and consent to participate
: This study was approved by the Apulian Regional Observatory for Epidemiology (AOO152/02Ago2013/n.9969) and was conducted according to the principles of the Declaration of Helsinki. Written informed consent was obtained from all individuals who provided specimens or from their legal guardians when applicable.
: Not applicable.
: The authors declare that they have no competing interests.