1. Department of Mechanical and Biomedical Engineering, Central Michigan University, Mount Pleasant, MI 48858.
2. Department of Engineering, Calvin College, Grand Rapids, MI 49546.
3. Arkanasas Children Hospital and the Department of Pediatrics, University of Arkansas for Medical Science, Little Rock, AR 72202.
4. Lovelace Respiratory Research Institute, 2425 Ridgecrest Dr SE, Albuquerque, NM 87108.