Does alpha1-antitrypsin augmentation therapy slow the annual decline in FEV1 in patients with severe hereditary alpha 1-antitrypsin deficiency? Wissenschaftliche Arbeitsgemeinschaft zur Therapie von Lungenerkrankungen (WATL) alpha 1-AT study group - Seersholm,N.; Wencker,M.; Banik,N. (Eur Respir J, 1997)