1. Second Department of Obstetrics Central Hospital of Handan Handan 056000 People's Republic of China
2. First Department of Geriatrics The First Hospital of Shijiazhuang City Shijiazhuang 050011 People's Republic of China
3. College of Materials Science and Engineering Hebei University of Engineering Handan Hebei 056000 People's Republic of China
4. Second Department of Oncology Affiliated Hospital of Hebei University of Engineering Handan 056000 People's Republic of China