- An international survey of chronic obstructive pulmonary disease in young adults according to GOLD stages. de Marco, R., Accordini, S., Cerveri, I., Corsico, A., Sunyer, J., Neukirch, F., Künzli, N., Leynaert, B., Janson, C., Gislason, T., Vermeire, P., Svanes, C., Anto, J.M., Burney, P. Thorax (2004)