“…In addition to the varying number of humans contributing to the ground truth in model development, there was variation in the specialty and experience of those contributing. Sources described their ground truth human(s) as a volunteer, 64 doctor/physician, 48 , 52 , 63 , 65 sonographer, 7 , 30 , 31 , 32 , 33 , 34 , 35 , 60 , 75 , 77 clinical professional, 27 , 38 or (regional) anaesthetist. 8 , 17 , 18 , 19 , 20 , 21 , 23 , 25 , 26 , 36 , 44 , 45 , 46 , 49 , 51 , 53 , 54 , 58 , 61 , 62 , 67 , 69 The level of expertise of those providing the ground truth was described as trained, 64 experienced, 21 , 30 , 31 , 32 , 33 , 34 , 46 , 48 , 52 , 65 expert, 7 , 8 , 17 , 18 , 19 , 20 , 25 , ...…”