Birthe Hellquist

Validity and underrecording of diagnosis of COPD in the Danish National Patient Registry.

P. Lange, P. Bartels, R. Thomsen, 2011, Respiratory medicine.

Identification of patients coded with COPD , pneumonia , and respiratory failure in the DNPR

P. Lange, P. Bartels, R. Thomsen, 2011 .

Effect of asthma compliance enhancement training on asthma control in patients on combination therapy with salmeterol/fluticasone propionate: a randomised controlled trial

V. Backer, R. Dahl, C. Ulrik, 2009, The clinical respiratory journal.