Airway responsiveness. Standardized challenge testing with pharmacological, physical and sensiitizing stimuli in adults. - Sterk,P.J.; Fabbri,L.M.; Quanjer,P.H.; Cockcroft,D.W.; O'Byrne,P.M.; Anderson,S.D.; Juniper,E.F.; Malo,J.L. (Eur Respir J, 1993)