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:

BACKGROUND: The association of coronavirus disease 2019 (COVID-19) with hypertension has been one of the frequently discussed topics in current studies since hypertension was identified as a risk factor for coronavirus disease. However, no studies seem to be focused on the BP (blood pressure) in patients with hypertension after COVID-19. REPORT: This report presents the cases of five frail geriatric patients (avg. age 78.3 (+/-6.4) years) with sarcopenia and controlled hypertension (office BP < 140 mmHg) who were diagnosed with SARS-CoV-2. FINDINGS: Control ABPM performed after COVID-19 showed that these hypertensive patients were hypotensive and that the previously well-established therapy was suddenly too intensive for them. CONCLUSIONS: These findings suggest that BP control after COVID-19 is needed and that ABPM is, particularly in frail geriatric patients, by no means a luxury but a necessity.
["Case Report"]