Schafroth Török, Salome, and Jörg D. Leuppi. “Bronchial Hyper-Responsiveness and Exhaled Nitric Oxide in Chronic Obstructive Pulmonary Disease”. Swiss Medical Weekly 137, no. 2728 (July 14, 2007): 385–385. Accessed November 28, 2024. https://smw.ch/index.php/smw/article/view/751.