Methods The 56 cases in MPP group were diagnosed and selected from patients in hospital from June to October 2005,including 33 cases in acute stage and 23 cases in recovery stage.

• 方法2005年6月至2005年10月诊断为MPP的住院患儿56例,其中急性期病人33例,恢复期病人23例,正常体检儿童13例作为对照组。