[1] Taichung Vet Gen Hosp, Dept Pediat, Div Pediat Cardiol, Taichung 40705, Taiwan
[2] Natl Yang Ming Univ, Dept Pediat, Taipei 112, Taiwan
[3] Natl Yang Ming Univ, Inst Clin Med, Taipei 112, Taiwan
[4] Natl Taiwan Univ, Inst Epidemiol & Prevent Med, Taipei 10764, Taiwan