To compare characteristics between groups, the chi-square test or Fisher’s exact test was used to analyze categorical variables, and the Mann–Whitney two-sample rank-sum test or the Kruskal-Wallis test applied for continuous variables. Multivariate analyses using logistic regression models were applied to identify the following: (1) the risk factors associated with the occurrence of FH; (2) the predictors of prognosis (recovery, carrier, or death).