HIGHLIGHTS
- who: Yu Cao from the A total of , healthy volunteers aged, years (, males and , females) were recruited from September to October All human blood samples were collected after written informed consent had been obtained. The subjects who tested positive for human immunodeficiency virus (HIV) infection, hepatitis viral infections, systemic infection, connective tissue disease, cancer, or abnormal tumor markers-including alpha-fetoprotein (AFP), carcinoembryonic antigen (CEA), carbohydrate antigen (CA-199), CA-153, and CA-125-were excluded from our study. This study was approved by the committee of ethics at Beijing Ditan Hospital, Capital Medical University, Beijing, China . . .
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