GSTM1 and acalculous cholecystitis: IVIG, Intravenous immunoglobulin G; AAC, Acute acalculous cholecystitis; KD, Kawasaki disease; WBC, White blood cell; Hb, Hemoglobin; Hct, Hematocrit; RBC, Red blood cell; MCV, Mean corpuscular volume; MCH, Mean corpuscular hemoglobin; MCHC, Mean corpuscular hemoglobin concentration; RDW, Red blood cell distribution width; BUN, Blood urea nitrogen; ESR, Erythrocyte sedimentation rate; CRP, C-reactive protein; TB, Total bilirubin; DB, Direct bilirubin; AST, Aspartate aminotransferase; ALT, Alanine aminotransferase; ALP, Alkaline phosphatase; Alb, Albumin