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Dyfyniad Arddull ChicagoRosser, Franziska, John M. Brehm, Erick Forno, Edna Acosta-Pérez, Kristen Kurland, Glorisa Canino, and Juan C. Celedón. "Proximity to a Major Road, Vitamin D Insufficiency, and Severe Asthma Exacerbations in Puerto Rican Children." Am J Respir Crit Care Med 2014.
Dyfyniad MLARosser, Franziska, et al. "Proximity to a Major Road, Vitamin D Insufficiency, and Severe Asthma Exacerbations in Puerto Rican Children." Am J Respir Crit Care Med 2014.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.