Early life exposure to farm animals and symptoms of asthma, rhinoconjunctivitis and eczema: an ISAAC Phase Three Study. - Brunekreef, Bert; Mutius, Erika Von; Wong, Gary K; Odhiambo, Joseph A; Clayton, Tadd O; Group, ISAAC Phase Three Study; ISAAC Phase Three Study Group (International Journal of Epidemiology, 2019)