POP1 and hemophagocytic syndrome: Modified HScores were significantly (p<0.0001) higher for HLH patients than COVID-19 patients for POP1 (HLH, 190.5±46.8; COVID-19, 132.8±40.1) and POP2 (HLH, 97.6±47.9; COVID-19, 38.0±26.8).