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Baseline heart rates in the active standing test and the effect of treatment in children with postural orthostatic tachycardia syndrome. PASC: postacute sequalae of SARS-CoV-2 infection/vaccination; POTS: postural orthostatic tachycardia syndrome. Paired t-test between baseline and treatment: * p-value < 0.05; b ** p-value < 0.01; *** p-value < 0.001.
