For each Study Visit, subjects will need to arrive at the study site early enough to complete all necessary baseline evaluations. The study site will provide an optional breakfast but it must be eaten at least 30 minutes prior to the pre-dose baseline FEV1 measurements. The optional breakfast will be light, and contain no added sugar. If the subjects decline the breakfast (i.e. they have already eaten a light breakfast prior to arriving), they are required to remain at the site for at least 30 minutes prior to the start of the Baseline FEV1 measurements, in order to maintain a stable physical status.