1. National Institutes of Health.
https://www.nih.gov
/.
2. National Institute for Health Research.
https://www.nihr.ac.uk
/,.
3. National Health and Medical Research Council.
https://www.nhmrc.gov.au
/.
4. National Heart Lung and Blood Institute (NHLBI).
https://www.nhlbi.nih.gov
/.
5. British Heart Foundation.
https://www.bhf.org.uk
/.