With so many national disasters in recent years, it's no wonder that many people are suffering with Post Traumatic Stress Disorder (PTSD). On average, PTSD starts within about three months of the catastrophic event; however, for some people, signs of PTSD don’t show up until years later. PTSD can happen to anyone at any age--e

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Blood (also called blood group) is a classification based on blood, the presence or absence of certain substances inherited antigen on the surface of red blood cells (erythrocytes). These antigens can be protein, carbohydrates, glicoproteine or glycolipids, depending on blood group system, and some of these antigens, are also p

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