1. Department of Pathology, The First Affiliated Hospital of Dalian Medical University, Dalian, Liaoning 116011, P.R. China
2. Department of Anesthesiology, Dalian Obstetrics and Gynecology Hospital, Dalian, Liaoning 116033, P.R. China
3. Department of Dermatology, The First Affiliated Hospital of Dalian Medical University, Dalian, Liaoning 116011, P.R. China