Airway impedance entropy and exacerbations in severe asthma
Sherif Gonem, Imraan Umar, Daniel Burke, Dhananjay Desai, Steven Corkill, John Owers-Bradley, Christopher E. Brightling, Salman Siddiqui
European Respiratory Journal Nov 2012, 40 (5) 1156-1163; DOI: 10.1183/09031936.00228611