Smartphone Software Application-mediated At-home Telespirometry (AHT) Artificial Intelligence(AI)-algorithm Identifies Similar Proportion of Valid Erect (eFVC) and Supine (sFVC) Forced Vital Capacity Measurements and Comparable per Subject Test-ReTest Variability Above and Below Forced Vital Capacity 60% Predicted in an Amyotrophic Lateral Sclerosis (ALS) Clinic Population (P5-11.013)