From the *Department of Nuclear Medicine, Beijing Friendship Hospital of Capital Medical University, Beijing, China; and †Department of Radiology, The Children’s Hospital of Philadelphia, Philadelphia, PA.
Received for publication March 19, 2012; and revision accepted March 27, 2012.
Conflicts of interest and sources of funding: Dr Yang was partially supported by the Natural Science Foundation of China (No. 81101069) and the Beijing Natural Science Foundation (No. 7112035). The other authors have nothing to declare.
Reprints: Hongming Zhuang, MD, PhD, Department of Radiology, The Children’s Hospital of Philadelphia, 34th St and Civic Center Blvd, Philadelphia, PA 19104. E-mail: firstname.lastname@example.org.