[1] Northwest Womens & Childrens Hosp, Dept Pediat, 3 Ward, Xian, Shaanxi, Peoples R China
[2] Allergy & Immunol Clin, Northwest Womens & Childrens Hosp, Xian, Peoples R China
[3] Shaanxi Prov Peoples Hosp, Dept Cardiol, Xian, Shaanxi, Peoples R China