Diverging trends of chronic bronchitis and smoking habits between 1998 and 2010
De, Accordini Simone, Corsico, Cerveri Isa, Antonicelli Leonardo, Attena Francesco, Bono Roberto, Casali Lucio, Ferrari Marcello, Fois Alessandro, Marchetti Pierpaolo, Pirina Pietro, Tassinari Roberta, Verlato Giuseppe