Anxiety is associated with diminished exercise performance and quality of life in severe emphysema: A cross-sectional study

Nicholas D. Giardino^*, Jeffrey L. Curtis, Adin Cristian Andrei, Vincent S. Fan, Joshua O. Benditt, Mark Lyubkin, Keith Naunheim, Gerard Criner, Barry Make, Robert A. Wise, Susan K. Murray, Alfred P. Fishman, Frank C. Sciurba, Israel Liberzon, Fernando J. Martinez