CRP and acalculous cholecystitis: KD, Kawasaki disease; AAC, Acute acalculous cholecystitis; RUQ, Right upper quadrant; RLQ, Right lower quadrant; WBC, White blood cell; ESR, Erythrocyte sedimentation rate; CRP, C-reactive protein; TB, Total bilirubin; DB, Direct bilirubin; ALP, Alkaline phosphatase; IVIG, Intravenous immunoglobulin G; Hb, Hemoglobin; AST, Aspartate aminotransferase; ALT, Alanine aminotransferase