Early-life allergen exposure and atopy, asthma, and wheeze up to 6 years of age. - Torrent, M; Sunyer, J; Garcia, R; Harris, J; Iturriaga, MV; Puig, C; Vall, O; Anto, JM; Newman, Taylor AJ; Cullinan, P (Am J Respir Crit Care Med, 2007)