- Theutilitymodeldisclosesaninvolutionsuctionpipe.Themiddlepartoftheinvolutionsuctionpipeiswoundtoformaspiralstructure.Wheninfectioncourseislongerthan5days,theinvolutiondegreeissevere.Themechanismofdevelopmentandinvolutionofhemangiomahasnotbeenclearlye...
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