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To assess the validity of bone age assessment by ultrasonography (US).Wrist US was performed on children (n = 100) undergoing radiographic bone age and compared with bone age estimation by a radiologist in the clinic and by endocrinologists under blinded conditions with Greulich and Pyle (GP) and Tanner and Whitehouse (TW3) methods.The strongest correlation (r 2 ) was seen in the radiographic...