Received: 23 April 2020
Accepted: 24 November 2020
First Online: 1 December 2020
Ethics approval and consent to participate
: The institutional board reviewed and approved the procedures of the study and each subject provided written informed consent. We conducted the study following the Declaration of Helsinki. The local ethical committee approved the protocol of the study (Comitato Etico Indipendente per le Indagini Cliniche Non Farmacologiche, Genova. Ref 05/2019, April 11, 2019).
: All authors have read and agree to the published version of the manuscript.
: SAF: scientific director of GEK srl. CM, SMC, TE, VL: speaking and teaching for GEK srl. SAF, CM, SMC: reporting of immunological tests for GEK srl.