14.10.2002
Comparison of the efficacy, tolerability, and safety of formoterol dry powder and oral, slow-release theophylline in the treatment of COPD
A. Rossi, P. Kristufek, B.E. Levine, M.H. Thomson, D. Till, J. Kottakis, G. Della Cioppa, for the Formoterol in Chronic Obstructive Pulmonary Disease (FICOPD) II Study Group
Chest, 2002; 121: 1058-1069