COVID-19(18) COVID-19 pandemic(14) Patient(12) SARS-CoV-2(10) significantly(10) Symptom(9) risk(9) diagnostic(9) Symptoms(9) Epidemiology(8) primary care(8) Diagnosis(8) Infection(7) positive(7) highest(7) age(7) SARS-COV-2 infection(7) develop(7) respiratory(7) Odds ratio(7) pandemic(6) Health services(6) exclusion(5) self-reported symptom(5) PCR testing(5) evaluate(5) Logistic regression(5) reference standard(5) 95% CI(5) clinical decision(5)