Because of the self-selected and nonprobabilistic nature of the sample, invitations and response rates could not be quantifiable, as reported by American Association for Public Opinion Research ( AAPOR) reporting guideline. All HCWs reporting that they work in Italy were eligible. The sampling period corresponded to the days immediately preceding the COVID-19 contagion peak, associated with the highest level of health care system utilization. Online consent was obtained from the participants. Approval for this study was obtained from the local institutional review board at University of L’Aquila. This cross-sectional, web-based study collected data between March 27 and March 31, 2020, using an online questionnaire spread via social networks using a snowball technique and sponsored social network advertisements.
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