Bibliographical noteFunding Information:
From the Laboratory of Physiological Hygiene, School of Public Health: and the Department of Pediatrics, Department of Medicine, Department of Physical Medicine and Rehabilitation, Department of Pharmacology, School of Medicine, University of Minnesota. This study was supported by Grant 5ROlHL-19877 and by Research Career Development Award K04HL-00329 of the National Institutes Health, Rehabilitation Research and Training Center No. 2, 16-P-56810 (5-19); and by grants from the Graduate School, University of Minnesota and the State of Minnesota.
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