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:

RATIONALE: This study aimed to describe cardiopulmonary function during exercise 3 months after hospital discharge for COVID-19 and compare groups according to dyspnea and intensive care unit (ICU) stay. METHODS: Participants with COVID-19 discharged from five large Norwegian hospitals were consecutively invited to a multicentre, prospective cohort study. In total, 156 participants (mean age 56.2 years, 60 females) were examined with a cardiopulmonary exercise test (CPET) 3 months after discharge and compared to a reference population. Dyspnea was assessed using the modified Medical Research Council dyspnea scale (mMRC). RESULTS: Peak oxygen uptake (VO2) <80% of predicted was observed in 31% (n=49). Ventilatory efficiency was reduced in 15% (n=24), while breathing reserve <15% was observed in 16% (n=25). Oxygen pulse <80% of predicted was found in 18% (n=28). Dyspnea (mMRC >/=1) was reported by 38% (n=59). These participants had similar peak VO2 (p=0.10), but lower mean peak (sd) VO2.kg(-1) % of predicted compared to participants without dyspnea (mMRC 0) (76 (16)% versus 89 (18)%, p =0.009) due to higher body mass index (p=0.03). In participants treated at ICU versus non-ICU, mean peak (sd) VO2% of predicted were 82 (15)% and 90 (17)% (p=0.004), respectively. Ventilation, breathing reserve, and ventilatory efficiency were similar between the ICU and non-ICU groups. CONCLUSIONS: One- third experienced peak VO2 <80% of predicted 3 months after hospital discharge for COVID-19. Dyspneic participants were characterised by lower exercise capacity due to obesity and lower ventilatory efficiency. Ventilation and ventilatory efficiency were similar between ICU- and non-ICU-treated participants.
["Diagnosis", "Treatment"]