1. Department of Emergency Medicine, Xijing Hospital, The Fourth Military Medical University, Xi’an 710032, China
2. Department of Nursing, Xijing Hospital, The Fourth Military Medical University, Xi’an 710032, China
3. Department of Human Anatomy, Histology and Embryology, The Fourth Military Medical University, Xi’an 710032, China
4. Faculty of Nursing, College of Medicine, Xi'an Jiaotong University, Xi’an 710049, China
5. Department of Dermatology, Xijing Hospital, The Fourth Military Medical University, Xi’an 710032, China