We collected data on clinical features, biochemical markers, and ultrasound findings.Results: Patient age ranged from 11.3 to 20.3 years (mean, 15.7 +/- 1.7 years), and body mass index (BMI) from 17.4 to 64.2 kg/m(2) (mean, 31.7 +/- 7.7 kg/m(2)). Seventy-one percent of patients...