1. World Health Organization. Cardiovascular diseases. 2016. [updated 2017 May 17]. Available from: https://www.who.int/news-room/fact-sheets/detail/cardiovascular-diseases-(cvds).
2. Centers for Disease Control and Prevention. Venous thromboembolism (Blood Clots) 2019. [Updated 2020 Feb 07]. Available from: https://www.cdc.gov/ncbddd/dvt/index.html.
3. Centers for Medicare and Medicaid services “never events”: An analysis and recommendations to hospitals;Mattie;Health Care Manag,2008
4. Maynard G. Preventing Hospital-Associated Venous Thromboembolism: A Guide for Effective Equality Improvement. 2nd ed.. Rockville, MD: Agency for Healthcare Research and Quality; August 2016. AHRQ Publication No. 16-0001-EF.
5. A survey of contemporary opinions and practices of surgical and intensive care specialists towards peri-operative venous thromboembolism prophylaxis in Asia;Lee;Int Angiol,2012