1. Department of Anesthesiology, First Affiliated Hospital of Jiamusi University, Jiamusi 154003, Heilongjiang, China
2. Department of Anesthesiology, Jiansanjiang Hospital of Beidahuang Group, Jiamusi 156399, Heilongjiang, China
3. Department of Anatomy, School of Basic Medical Sciences, Jiamusi University, Jiamusi 154007, Heilongjiang, China