1. Surgery Center, The First Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150001, P.R. China
2. Department of Hyperbaric Oxygen Therapy, Harbin Children's Hospital, Harbin, Heilongjiang 150010, P.R. China
3. Department of Anesthesiology, The First Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150001, P.R. China