<n0:ComplexDefinition xmlns:n0="http://ncicb.nci.nih.gov/xml/owl/EVS/ComplexProperties.xsd#"><n0:def-definition>A group of rare inherited platelet disorders that involve abnormalities of platelet function or platelet production and that usually cause moderate to severe bleeding problems.</n0:def-definition><n0:def-source>NCI</n0:def-source></n0:ComplexDefinition>