Heuss, Ludwig Theodor, Shajan Peter Sugandha, and Lukas Degen. “Cost-Effectiveness Analysis of Surgical Lung Volume Reduction Compared With Endobronchial Valve Treatment in Patients With Severe Emphysema”. Swiss Medical Weekly 142, no. 4546 (November 4, 2012): 13726. Accessed August 6, 2024. https://smw.ch/index.php/smw/article/view/3256.