1. American Heart Association 2003 International cardiovascular disease statistics. http://www.americanheart.org
2. American Heart Association 2003 High blood pressure statistics http://www.americanheart.org
3. 2003 Statistics and data at hand http://www.chinatoday.com/data/data.htm
4. World Health Organization 2003 Fact Sheet No. 138 http://www.who.org