Outcomes and follow up.

All results except follow up length have been displayed as total number with percentage proportion in brackets. Follow up length has been represented as median with IQR in brackets. Mortality rates have been displayed as number of deaths with percentage proportion of at risk population for time period in brackets. Statistical significance was determined using unpaired t-test for continuous variable, chi-square test for categorical variables with a sample size over five, and Fisher’s exact test for categorical variables with a sample size equal to or less than five.除随访时长外，其余所有结果均以总例数（括号内标注对应占比）的形式呈现。随访时长以中位数（四分位距，Interquartile Range, IQR）的形式呈现。死亡率以死亡例数（括号内为对应时段内风险人群的占比）的形式呈现。统计学显著性采用以下方法确定：连续变量采用独立样本t检验；样本量大于5的分类变量采用卡方检验；样本量小于等于5的分类变量采用费舍尔精确检验。