1. Department of Clinical Laboratory, Beijing Chao-Yang Hospital, Capital Medical University, Beijing, China;
2. Department of Clinical Laboratory, Ophthalmological Hospital, Chinese Academy of Traditional Chinese Medicine, Beijing, China;
3. Department of Clinical Laboratory, Beijing You-an Hospital, Capital Medical University, Beijing, China;
4. Department of Clinical Laboratory, Beijing Di-Tan Hospital, Capital Medical University, Beijing, China;
5. Department of Clinical Laboratory, Beijing Fu-Xing Hospital, Capital Medical University, Beijing, China;
6. Department of Clinical Laboratory, Beijing Fang-Shan Hospital, Beijing, China;
7. Beijing Center for Clinical Laboratories, Beijing, China