1. Anesthesia and Brain Research Institute Shanghai Tenth People's Hospital School of Medicine Tongji University Shanghai 200072 P. R. China
2. Department of Anesthesiology National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital Chinese Academy of Medical Sciences and Peking Union Medical College Beijing 100021 P. R. China
3. Division of Thoracic Surgery Department of Surgery Massachusetts General Hospital and Harvard Medical School Boston MA 02114 USA
4. Tongji University Cancer Center Shanghai Tenth People's Hospital School of Medicine Tongji University Shanghai 200072 P. R. China
5. Geriatric Anesthesia Research Unit, Department of Anesthesia, Critical Care and Pain Medicine Massachusetts General Hospital and Harvard Medical School Charlestown MA 02129 USA