1. Department of Pathology, Beijing Obstetrics and Gynecology Hospital, Capital Medical University, Beijing�100006, P.R. China
2. Department of ICU, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100037, P.R. China
3. Department of Pathology, Beijing Friendship Hospital, Capital Medical University, Beijing 100050, P.R. China
4. Department of Pathology, Capital Medical University Electric Power Teaching Hospital (State Grid Corporation Beijing Electric Power Hospital), Beijing�100037, P.R. China
5. Department of Cardiology, East Hospital, Tongji University, Shanghai 200120, P.R. China