1. Department of Nursing, General Hospital of Taiyuan Iron & Steel Co., Ltd, Taiyuan, 030008 Shanxi, China
2. Department of Gynaecology and Obstetrics, General Hospital of Taiyuan Iron & Steel Co., Ltd, Taiyuan, 030003 Shanxi, China
3. Department of Nursing, Taiyuan Fourth People’s Hospital, Taiyuan, 030053 Shanxi Province, China
4. Department of Nursing, Shanxi Cancer Hospital, Taiyuan, Shanxi 030013, China