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The visualization of Gaussian mixed model cluster plots. #: SARS-CoV-2 anti-S1 IgG antibodies were measured a median of 4 days after admission to the hospital; ¶: decreases in circulating lymphocytes were defined as the lowest T-, B- and natural killer (NK) cell absolute counts recorded after admission; +: interleukin-6 (IL-6) increase was defined as the maximal serum level recorded after admission.
