The impact of the COVID-19 pandemic on the mental health of healthcare workers: study protocol for the COVID-19 HEalth caRe wOrkErS (HEROES) study, Mascayano, Franco, van der Ven Els, Moro Maria Francesca, Schilling Sara, Alarcón Sebastián, Al Barathie Josleen, Alnasser Lubna, Asaoka Hiroki, Ayinde Olatunde, Balalian Arin A., et al. , Social Psychiatry and Psychiatric Epidemiology, Oct-01-2023, (2022)