“…The majority of studies were conducted in the United States ( n = 9; 36%) 32 – 40 and China ( n = 9; 36%), 41 – 49 followed by the United Kingdom ( n = 3; 12%), 50 – 52 and one (4%) each in Australia, 53 Netherland, 54 Pakistan, 55 and Sudan 56 ( Table 1 ). Most of the studies ( n = 8; 32%) were carried out in orthopedic surgery, 35 , 37 , 38 , 41 , 44 , 47 , 49 , 52 followed by five (20%) studies each that included multiple units 43 , 53 – 56 and general surgery 39 , 42 , 46 , 50 , 51 ( Table 1 ). Three studies (12%) were conducted in bariatric surgical units, 33 , 34 , 40 and two (8%) each in cardiothoracic 36 ,…”