Community study of role of viral infections in exacerbations of asthma in 9-11 year old children - Johnston, S L; Pattemore, P K; Sanderson, G; Smith, S; Lampe, F; Josephs, L; Symington, P; O’toole, S; Myint, S H; Tyrrell, D A (BMJ, 1995)
et al.