http://www.nhlbi.nih.gov/health/health-topics/topics/itp/ idiopathic thrombocytopenic purpura thrombocytopenia purpura National Heart Lung and Blood Institute http://www.nhlbi.nih.gov/health/health-topics/topics/itp/ http://www.nhlbi.nih.gov/health/health-topics/topics/itp/ Immune Thrombocytopenia National Heart Lung & Blood Foundation Immune Thrombocytopenia National Heart Lung and Blood Institute NIH http://www.nhlbi.nih.gov/health/health-topics/topics/itp/ National Heart Lung and Blood Institute thrombocytopenia purpura What Is Idiopathic Thrombocytopenic Purpura? National Heart Lung and Blood Institute Immune Thrombocytopenia http://www.nhlbi.nih.gov/health/health-topics/topics/itp/ Immune Thrombocytopenia