Prognostic factors
To investigate the prognostic factors associated with treatment response, we conducted a multivariable logistic analysis (Table 3). Although none of variables showed a statistically significant association with treatment response according to the univariate analysis, the multivariable logistic model controlling for significant covariables which had a p -value less than 0.15 in the univariate model (duration of symptoms before admission, cough, nausea, and hemoglobin), revealed that cough (OR, 0.02; 95% confidence interval, 0.01-0.40; p = 0.01) was an independent factor for predicting treatment response.