Article 4 Humans 4 adult 4 aged human 4 male blood 3 female 3 middle aged 3 Adult 2 Female 2 Male 2 Middle Aged 2 ROC Curve 2 controlled study 2 diagnostic value 2 procedures 2 protein blood level 2 receiver operating characteristic 2 risk factor 2 young adult 2 Adolescent 1 Age Factors 1 Aged 1 Antigens, Neoplasm 1 Biomarkers, Tumor 1 CEACAM5 protein, human 1 COVID-19 1 COVID-19 Testing 1 Carcinoembryonic Antigen 1