1. Department of Cardiology, Guangdong Cardiovascular Institute, Guangdong Provincial People's Hospital Guangdong Academy of Medical Sciences Guangzhou China
2. Hypertension Research Laboratory, Guangdong Provincial Clinical Research Center for Cardiovascular Disease, Guangdong Cardiovascular Institute, Guangdong Provincial People's Hospital Guangdong Academy of Medical Sciences Guangzhou China
3. Community Health Center of Xiaolan Town Zhongshan China