GPT and hemophagocytic syndrome: HLH, haemophagocytic lymphohistiocytosis; ICU, intensive care unit; CBC, complete blood count; AST, aspartate aminotransferase; ALT, alanine aminotransferase; LDH, lactate dehydrogenase; EBV, Epstein–Barr virus; CMV, cytomegalovirus; sIL-2R, soluble interleukin-2 receptor.