Effect of airway clearance techniques on the efficacy of the sputum induction procedure
M. R. Elkins, T. Lane, H. Goldberg, J. Pagliuso, L. A. Garske, E. Hector, L. Marchetto, J. A. Alison, P. T. P. Bye
European Respiratory Journal 2005 26: 904-908; DOI: 10.1183/09031936.05.00033105