1. Department of Anesthesia, China-Japan Union Hospital of Jilin University, Changchun, Jilin, P.R. China
2. Geriatric Anesthesia Research Unit, Department of Anesthesia, Critical Care and Pain Medicine, Massachusetts General Hospital and Harvard Medical School, Charlestown, MA, USA
3. Department of Psychiatry, Tenth People’s Hospital of Tongji University, Shanghai, P.R. China