作者单位:Taipei Vet Gen Hosp, Dept Pediat, Taipei, Taiwan[1]All India Inst Med Sci, Dept Pediat, New Delhi, India[2]MacKay Mem Hosp, Dept Med Educ, Taipei, Taiwan[3]China Med Univ, Childrens Hosp, Div Pediat Pulmonol, 2 Yuh Der Rd, Taichung 40447, Taiwan[4]