1. Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Taoyuan, Taiwan (T.Y.)
2. Institute of Population Health Sciences, National Health Research Institutes, Zhunan, Taiwan (Y.H., S.T., H.T.)
3. National Cheng-Kung University, Tainan, Taiwan (S.C.)
4. Harvard Pilgrim Health Care Institute, Harvard Medical School, and Boston Children's Hospital, Boston, Massachusetts (A.C.W.)