RT Journal Article SR Electronic T1 The patient perspective of alpha-1 antitrypsin deficiency: disease burden and unmet needs JF Breathe JO Breathe FD European Respiratory Society SP 200340 DO 10.1183/20734735.0340-2020 VO 17 IS 1 A1 Marion Wilkens A1 Michael Bartlett A1 Frank Willersinn A1 Karen O'Hara A1 Jeanette Boyd A1 Jessica Denning YR 2021 UL http://breathe.ersjournals.com/content/17/1/200340.abstract AB