6LIN HC, HWANG KC, YANG YH, et al. Risk factors of wheeze and allergy after lower respiratory tract infections during early childhood [J]. J Microbiol Immunol Infect, 2001, 34: 259-264.
7VON MUTIUS E. Infection: friend or foe in the development of atopy and asthma ? The epidemiological evidence [J]. Eur Respir J, 2001 ,18:872-881.
