1. School of Nursing, Huizhou Health Sciences Polytechnic, Huizhou, Guangdong Province, P. R. China
2. Department of Cardiothoracic Surgery, The Third People’s Hospital of Huizhou, Huizhou, Guangdong Province, P. R. China
3. School of Foreign Languages, Huizhou University, Huizhou, Guangdong Province, P. R. China
4. School of Clinical Medicine, Huizhou Health Sciences Polytechnic, Huizhou, Guangdong Province, P. R. China
5. School of Medicine and Medical Laboratory Science, Huizhou Health Sciences Polytechnic, Huizhou, Guangdong Province, P. R. China