<Li> Familial cold urticaria </Li> <Li> Leukemia (chronic myelogenous (CML)) and other myeloproliferative disorders </Li> <Li> Surgical removal of spleen </Li> <Ul> <Li> Infection </Li> <Li> Chronic inflammation--especially juvenile rheumatoid arthritis, rheumatoid arthritis, Still's disease, Crohn's disease, ulcerative colitis, granulomatous infections (for example, tuberculosis), and chronic hepatitis </Li> <Li> Cigarette smoking--occurs in 25--50% of chronic smokers and can last up to 5 years after quitting </Li> <Li> Stress--exercise, surgery, general stress </Li> <Li> Medication induced--corticosteroids (for example, prednisone, β - agonists, lithium) </Li> <Li> Cancer--either by growth factors secreted by the tumor or invasion of bone marrow by the cancer </Li> <Li> Increased destruction of cells in peripheral circulation can stimulate bone marrow . This can occur in hemolytic anemia and idiopathic thrombocytopenic purpura </Li> </Ul>

What is the structure of white blood cells