ACKNOWLEDGEMENTS
The authors thank Drs DB Sanders and M Bozic for their advice and guidance during the study. Research funded through a CF Foundation Clinical Fellowship grant (MUSTON18A0-D3-SL), Indiana University CTSI grant (UL1TR001108), CF Foundation grant DAVIS08Y2 and NIH grant 5R01HL116211-03 to S Davis, T Ferkol and S Ranganathan.