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Lung function and sputum characteristics of patients with severe asthma during an induced exacerbation by double-blind steroid withdrawal.

P. Sterk, E. Bel, H. Smits, 1999, American journal of respiratory and critical care medicine.

Successful patient self-management of COPD requires hands-on guidance.

N. Chavannes, O. V. van Schayck, T. van der Molen, 2013, The Lancet. Respiratory medicine.

Methods for sputum induction and analysis of induced sputum: a method for assessing airway inflammation in asthma.

J. Kips, J. Fahy, F. Hargreave, 1998, The European respiratory journal. Supplement.

Complications in the use of the subcutaneous tunnelled intratracheal oxygen catheter.

J. Stolk, J. C. in't Veen, J. Dijkman, 1996, The Netherlands journal of medicine.

[The NHG guidelines 'Adult asthma' and 'COPD'].

M. Tuut, N. Chavannes, I. Smeele, 2015, Nederlands tijdschrift voor geneeskunde.