1. Department of Emergency, Affiliated Hospital of Weifang Medical University, Weifang, Shandong 261031, P.R. China
2. Department of Ophthalmology, Affiliated Hospital of Weifang Medical University, Weifang, Shandong 261031, P.R. China
3. Department of Obstetrics, Affiliated Hospital of Weifang Medical University, Weifang, Shandong 261031, P.R. China
4. Comprehensive Ward, Hetan Hospital in Hanting District of Weifang, Weifang, Shandong 261031, P.R. China
5. Operation Room, Affiliated Hospital of Weifang Medical University, Weifang, Shandong 261031, P.R. China