1 Centre for the Diagnosis of Hereditary Deficiency of a1-antitrypsin, Department of Molecular Medicine, Pneumology Section, University of Pavia, Pavia, Italy. Electronic address: i.ferrarotti@smatteo.pv.it.
2 Swiss Tropical and Public Health Institute, Basel, Switzerland; University of Basel, Basel, Switzerland.
3 Centre for the Diagnosis of Hereditary Deficiency of a1-antitrypsin, Department of Molecular Medicine, Pneumology Section, University of Pavia, Pavia, Italy.