Dr. Heyu Ni, St. Michael's Hospital (image) St. Michael's Hospital Caption "Most treatments that help the body stop bleeding can actually cause blood clots and many treatments to prevent excessive blood clots increase risk of bleeding out," said Dr. Heyu Ni, the principal investigator and a scientist in the Keenan Research Centre for Biomedical Science of St. Michael's Hospital. Credit St. Michael's Hospital Usage Restrictions Please provide credit. Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.