Funding/Support
BLOOD, HEART, LUNG
The INCREASE study was sponsored by United Therapeutics Corporation but this manuscript was not funded by any entity. S. R. is supported by the National Heart, Lung, and Blood Institute [Grant R01HL153872], the National Institute of General Medical Sciences [Grant R01GM122798], and the American Heart Association [Grant TPA34880033]. F. R. is supported by the National Institutes of Health and the National Heart, Lung, and Blood Institute. V. F. T. is supported by the National Institutes of Health.