1. Department of Anaesthesia, The Second Affiliated Hospital of Fujian Medical University, Quanzhou, Fujian 362000, P.R. China
2. Centre of Neurological and Metabolic Research, The Second Affiliated Hospital of Fujian Medical University, Quanzhou, Fujian 362000, P.R. China
3. Department of Nursing, Fujian University of Traditional Chinese Medicine, Fuzhou, Fujian 350100, P.R. China