Thun G, Ferrarotti I, Imboden M, Rochat T, Gerbase M, Kronenberg F, Bridevaux P, Zemp E, Zorzetto M, Ottaviani S, Russi EW, Luisetti M, Probst-Hensch NM. SERPINA1 PiZ and PiS Heterozygotes and Lung Function Decline in the SAPALDIA Cohort. PLoS ONE. 2012 Aug 13;7(8):e42728. doi: 10.1371/journal.pone.0042728.