1. Department of Physical Medicine and Rehabilitation, Johns Hopkins University School of Medicine, Baltimore, MD, USA
2. Division of Pulmonary and Critical Care Medicine, Johns Hopkins University, Baltimore, MD, USA
3. Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, MD, USA
4. Department of Pulmonary and Critical Care Medicine, Allegheny Health Network, Pittsburg, PA, USA
5. Kennedy Krieger Institute, Center for Movement Studies, Baltimore, MD, USA