“…Out of the fifteen included studies, three were conducted in Italy (20.0%) (40,42,43), two in China (13.3%) (45,46), two in USA (13.3%) (51, 53), one each (6.7%) in the following countries: Cyprus (48), France (41), Portugal (50), Romania (39), Sabah (47), Saudi Arabia (49), Turkey (44), UK and Ireland (52). Thirteen studies were conducted on healthcare workers (86.6%) (39,(41)(42)(43)(44)(45)(46)(47)(48)(49)(50)(51)53), one on frontline workers (6.7%) (52), and one on psychologists (6.7%) (40). Concerning sample size, one study (6.7%) had a sample ≤ 100 (51), six (40.0%) had a sample size between 101 and 200 (39,43,44,47,50,53), two (13.3%) had a sample size between 201 and 500 (40,49), two (13.3%) between 501 and 1,000 (45,46), and four (26.6%) had a sample size ≥ 1,000 (41,42,48,52).…”