For the Screening and Study Visits, the subjects will be required to be at the site for a 30 minute "resting period". This resting period is designed to maintain a stable and consistent physical status of the subjects prior to the start of the baseline FEV1 procedures. For the Screening Visit, this period will begin upon subject arrival. For the Study Visits, the period will begin at the end of the option breakfast (or upon arrival if the breakfast is declined).