World Bank Quarterly External Debt Statistics (QEDS). In an effort to facilitate comparison and analysis of countries' external debt positions, the IMF and World Bank launched an online database on November 18, 2004 that offers better access to timely and comparable quarterly external debt statistics for 55 countries.
White blood cell. White blood cells (also called leukocytes or immune cells) are cells which form a component of the blood. They help to defend the body against infectious disease and foreign materials as part of the immune system. There are normally between 4x109 and 11x109 white blood cells in a litre of healthy adult blood - about 7,000 to 25,000 white blood cells per drop.
Like the thymus, the spleen houses and aids in the maturation of immune system cells called lymphocytes. Lymphocytes are white blood cells that protect against foreign organisms that have managed to infect body cells. Lymphocytes also protect the body from itself by controlling cancerous cells. The spleen is valuable to the immune response against antigens in the blood.