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Vitamin D (A) and parathyroid hormone (PTH) (B) concentration according to disease severity at eight weeks follow-up: serum concentrations of (A) 25-hydroxyvitamin D (25(OH)D) and (B) PTH. Disease severity was graded according to intensity of treatment: mild = ambulatory treatment; moderate = hospital treatment; severe=inward treatment with respiratory (oxygen) supply or treatment at the ICU with non-invasive or invasive ventilation.
