aHLH-2004 adjusted HLH-2004 criteria ASAT aspartate aminotransferase HLH hemophagocytic lymphohistiocytosis HPS hemophagocytic syndrome ICU intensive care unit MAS macrophage activation syndrome NK natural killer OHI optimized HLH inflammatory oHLH-2004 optimized HLH-2004 criteria pHLH primary hemophagocytic lymphohistiocytosis revHLH-2004 revised HLH-2004 criteria ROC receiver operating characteristics shHLH-2004 shortened HLH-2004 criteria sHLH secondary hemophagocytic lymphohistiocytosis...