Reestimated reference equations for the 5th percentiles of lung function variables in the adult population of Switzerland (SAPALDIA-study) - Brändli,O.; Leuenberger,Ph.; Schindler,C.; Baur,X.; Degens,P.; Künzli,N.; Keller,R.; Perruchoud,A.P. (Thorax, 2000)