1. ICU, Dongguan Houjie Hospital, Dongguan, Guangdong 523945, P.R. China
2. Nursing Department, Dongguan Houjie Hospital, Dongguan, Guangdong 523945, P.R. China
3. School of Nursing, Guangdong Medical University, Dongguan, Guangdong 523808, P.R. China
4. Department of General Surgery, Dongguan Houjie Hospital, Dongguan, Guangdong 523945, P.R. China