1. Department of Obsterics Ultrasound, The First People's Hospital of Yunnan Province The Affiliated Hospital of Kunming University of Science and Technology Kunming Yunnan 650034 China
2. Department of Ultrasound Echocardiography, Yanan Hospital of Kunming City Yunnan Cardiovascular Hospital Kunming Yunnan 650233 China
3. Department of Neurosurgery The Affiliated Hospital of Yunnan University, The Second People's Hospital of Yunnan Kunming Yunnan 650021 China
4. Department of Cardiovascular Medicine First Affiliated Hospital of Kunming Medical University Kunming Yunnan 650032 China
5. Department of Cardiovascular Medicine Sir Run Run Hospital Affiliated Nanjing Medical University Nanjing Jiangsu 211166 China