Variations in the prevalence across countries of chronic bronchitis and smoking habits in young adults
I. Cerveri, S. Accordini, G. Verlato, A. Corsico, M.C. Zoia, L. Casali, P. Burney, R. de Marco
European Respiratory Journal Jul 2001, 18 (1) 85-92; DOI: 10.1183/09031936.01.00087101