1.
Schafroth Török S, D. Leuppi J. Bronchial hyper-responsiveness and exhaled nitric oxide in chronic obstructive pulmonary disease. Swiss Med Wkly [Internet]. 2007 Jul. 14 [cited 2024 Oct. 11];137(2728):385-. Available from: https://smw.ch/index.php/smw/article/view/751