[1] Natl Taiwan Univ, Inst Epidemiol & Prevent Med, Coll Publ Hlth, Taipei 100, Taiwan
[2] Taipei Hosp, Dept Pediat, Dept Hlth, Taipei, Taiwan
[3] China Med Univ, Coll Publ Hlth, Taichung, Taiwan
[4] Fu Jen Catholic Univ, Coll Med, Taipei, Taiwan
[5] Natl Taiwan Univ Hosp, Dept Pediat, Taipei 10016, Taiwan