The present study has been authorized by the Committee on Bioethics of the University of Pisa (Review No. 5/2020; AOO “CLE”—Prot.: 0036356/2020 of 10/04/2020). The study was purely observational and data were entered in an anonymous form (an alphanumerical code has been uniquely assigned to each subject). People have been observed in their natural social setting without any modification of their ordinary and daily activities.
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