1 The Key Laboratory of Cardiovascular Remodeling and Function Research, Chinese Ministry of Education and Chinese Ministry of Health; The State and Shandong Province Joint Key Laboratory of Translational Cardiovascular Medicine, Qilu Hospital of Shandong University, No. 107#, Wenhua West Road, Jinan, 250012, Shandong, People's Republic of China.
2 Cardiovascular Ultrasound and Non-invasive Cardiology Department, Sichuan Academy of Medical Sciences & Sichuan Provincial People's Hospital, Chengdu, 610072, Sichuan, People's Republic of China.
3 School of Mathematics, Shandong University, Jinan, 250012, Shandong, People's Republic of China.
4 The Key Laboratory of Cardiovascular Remodeling and Function Research, Chinese Ministry of Education and Chinese Ministry of Health; The State and Shandong Province Joint Key Laboratory of Translational Cardiovascular Medicine, Qilu Hospital of Shandong University, No. 107#, Wenhua West Road, Jinan, 250012, Shandong, People's Republic of China. daixh@vip.sina.com.