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Nightingale rose diagram: illustration of > 28 and ≥ 91 days symptoms in patients with long COVID. The area of each colored bar indicates the number of cases. (A) signifies the percentage of patients experiencing ongoing symptoms lasting > 28 days among the 691 patients surveyed at baseline; (B) signifies the percentage of patients with long COVID symptoms lasting ≥ 91 days among the 600 patients in the follow-up survey
