作者单位:Department of Biostatistics, Vanderbilt Clinical Research Center, Vanderbilt University, Nashville[1]Department of Radiology, Texas Children's Hospital, 6701 Fannin St, Ste 470, Houston, TX 77030[2]Department of Radiology and Radiological Sciences, Monroe Carell Jr. Children's Hospital at[3]Department of Internal Medicine, Gunderson Lutheran Medical Center, La Crosse, WI, United States[4]