39.
de Marco R., Pesce G., Marcon A., Accordini S., Antonicelli L., Bugiani M., Casali L., Ferrari M., Nicolini G., Panico M.G., Pirina P. i wsp. The coexistence of asthma and chronic obstructive pulmonary disease (COPD): prevalence and risk factors in young, middle-aged and elderly people from the general population. PLoS One 2013; 8(5): e62985, doi: 10.1371/journal.pone.0062985.