Does eczema in infancy cause hay fever, asthma, or both in childhood? Insights from a novel regression model of sibling data

John L. Hopper^*, Quang M. Bui, Bircan Erbas, Melanie C. Matheson, Lyle C. Gurrin, John A. Burgess, Adrian J. Lowe, Mark A. Jenkins, Michael J. Abramson, E. Haydn Walters, Graham G. Giles, Shyamali C. Dharmage