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:

Objective: This study aimed to determine the clinical and epidemiological characteristics and outcomes of Coronavirus disease (COVID)-19 patients. Methods: In this large cohort study, 15,409 confirmed patients with the COVID-19 of different severities were followed-up from three specialized COVID-19 hospitals between March 18 and October 11, 2020 in Iraqi Kurdistan. The predictors of mortality and severity were examined in binary logistic regression analysis. Results: The incidence rate of severe/critical status was 12.3% with a median age of 36.0 and case fatality rate (CFR) of 1.98%. The incidence rate of severe/critical conditions and CFR rose with increased age groups; except for 0-14 years (11.9%). The incidence rate of severe/critical patients and CFR was 8.3% and 0.5%, 21.1% and 4.0%, and 23.7% and 8.7% in 15-49 years, 50-64 years, and 65 and older age groups, respectively. The severity of the disease and CFR was associated with coexisting chronic diseases such as cardiovascular diseases (18.2% and 3.1%) and diabetes mellitus (19.8% and 3.4%). The asymptomatic patients (8400 and 54.5%) had statistically higher CFR; 2.3% versus 1.6% (P = 0.006). The most common symptoms on diagnosis were fever (31.9%), cough (23.5%), loss of smell/taste (16.3%), sore throat (15.7%), shortness of breath (9.8%), and headache (9.5%). The results showed that being older was the only predictor of mortality and severity in COVID-19 patients. Conclusions: This region has a low incidence of severe-critic status and CFR. The patients with coexisting medical conditions are more likely to have severe conditions and die of COVID-19. The older age predicts severe/critic status and higher CFR.
["Diagnosis", "Treatment"]