You are presented with a paragraph from a COVID-19 literature. Classify the topics of this piece of text by choosing from the following categories:

- Epidemic Forecasting: The content relates to predictions about the spread of COVID-19.
- Treatment: The paragraph discusses therapeutic methods or medication for COVID-19.
- Prevention: The content covers measures to prevent the spread of COVID-19.
- Mechanism: The paragraph explains the biological mechanisms of the virus.
- Case Report: The content is a report of a COVID-19 case.
- Transmission: The paragraph discusses how COVID-19 is transmitted.
- Diagnosis: The content is about diagnosing COVID-19 in individuals.

Your classification should be provided as an element within a JSON array. The array should be formatted with topics enclosed in double quotes and separated by commas, following the JSON format, for example: ["Topic1", "Topic2", ...]. Include all applicable topics within the array. Your output should be a valid JSON array, and no additional text should be included in your response.

Article:

Objectives: Coronavirus disease 2019 (COVID-19) have different clinical presentations in children. Most symptomatic children with suspicion of COVID-19 have fever and respiratory symptoms. In this retrospective study, we aimed to describe demographic features, clinical characteristics, and outcomes of confirmed and probable COVID-19 patients admitted to our pediatric emergency department (ED). Methods: We identified 135 children (aged 1 month-18 years) with suspicion of the COVID-19 who were admitted to our ED between March 11 and May 12, 2020. The urgency of patients was evaluated according to their Pediatric Assessment Triangle (PAT) and Emergency Severity Index (ESI) scores. Patients were divided into two groups as confirmed cases (Group 1) and probable cases (Group 2). Clinical, laboratory, radiologic features, and the disease severity of patients were analyzed. Results: According to PAT evaluation, 82 patients (65.6%) were non-urgent. The most frequent ESI triage category level was 3 (n=102, 76.1%). Forty-one (30.4%) patients were identified as laboratory-confirmed cases. Fifty-five (40.7%) patients were between 28 days and 4 years of age. Fever with cough was the most frequent symptoms at the onset of illness in COVID-19 positive patients (n=16, 39%). Sixty-four (47.4%) patients had mild disease and 40 (29.6%) patients had comorbidities. In Group 1, neutropenia was significantly higher than Group 2 (p=0.024). Mean procalcitonin and erythrocyte sedimentation rate levels of Group 2 were significantly higher than Group 1 (p=0.012 and p=0.028, respectively). Twenty-eight of 51 patients had chest computed tomography findings which were compatible with COVID-19. Fifty-one (37.8%) patients were discharged from ED, 81 (60%) were admitted to the ward, and 3 (2.2%) were admitted to the pediatric intensive care unit. Conclusion: During our study, we confirmed the diagnosis of 45 of 135 probable cases with the SARS-CoV-2 polymerase chain reaction test. Among confirmed COVID-19 cases, most of our patients had mild or moderate disease. The clinic of only confirmed three patients was classified as severe disease, and we had no critically ill patient.
["Diagnosis"]