“…The types of ICUs included medical, 25 , 29 , 30 , 31 , 32 surgical, 33 cardiovascular, 22 , 29 , 34 neuro, 25 , 28 oncology, 30 and COVID-19 35 ICUs. Eight studies were conducted at a single site in a single unit, 22 , 23 , 28 , 31 , 32 , 33 , 34 , 35 five at a single site in multiple units, 25 , 27 , 29 , 30 , 36 , and two in multiple centers. 24 , 26 Most of the studies were conducted in the United States (10 out of 15), and the rest were conducted in other countries, including Italy ( n = 2), Australia ( n = 1), China ( n = 1), and Iran ( n = 1).…”