title: Population and sampling are important factors to consider in evaluation of a medical test.
authors.forename: S T
authors.initials: ST
authors.lastname: Wang
mesh_terms: D002294:Carcinoma, Squamous Cell / Q000175:diagnosis / Q000473:pathology*; D005069:Evaluation Studies as Topic; D005260:Female; D006801:Humans; D008297:Male; D008403:Mass Screening / Q000379:methods*; D009303:Nasopharyngeal Neoplasms / Q000175:diagnosis / Q000473:pathology*; D016133:Polymerase Chain Reaction / Q000379:methods*; D012494:Sampling Studies; D012680:Sensitivity and Specificity