Synergism between allergens and viruses and risk of hospital admission with asthma: case-control study.
Green, Rosalind M; Custovic, Adnan; Sanderson, Gwen; Hunter, Jenny; Johnston, Sebastian L; Woodcock, Ashley; BMJ: British Medical Journal (International Edition), 2002, vol. 324, issue 7340, p 763, ISSN 09598146. ISBN 17561833.
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