RT Journal Article SR Electronic T1 Surgical approaches for lung volume reduction in emphysema JF Clinical Medicine JO Clin Med FD Royal College of Physicians SP 558 OP 558 DO 10.7861/clinmedicine.14-5-558 VO 14 IS 5 A1 Emma Crawford A1 Koottalai Srinivasan A1 Harmesh Moudgil A1 Thirumalairengarajan Naicker A1 Nawaid Ahmad YR 2014 UL http://www.rcpjournals.org/content/14/5/558.1.abstract