CALCA and systemic inflammatory response syndrome: Abbreviations: BISAP, bedside index of severity in acute pancreatitis; BMI, body mass index; BUN, blood urea nitrogen; CR, creatinine; CRP, c-reactive protein; EtOH, ethyl alcohol; HAPS, harmless acute pancreatitis score; HCT, hematocrit; HTG, hypertriglyceridemia; PCT, procalcitonin; SIRS, systemic inflammatory response system; WBC, white blood cell