Criteria for the Diagnosis of Attention Deficit–Hyperactivity Disorder (ADHD)

According to the Diagnostic and Statistical Manual of Mental Disorders, fifth edition (DSM-5), attention deficit–hyperactivity disorder (ADHD) is characterized by symptoms of impulsivity, inattention, and hyperactivity that emerge in childhood.
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Serum Levels That Differentiate Anemia of Chronic Disease from Iron-Deficiency Anemia

Iron deficiency anemia develops when body stores of iron drop too low to support normal red blood cell (RBC) production. Inadequate dietary iron, impaired iron absorption, bleeding, or loss of body iron in the urine may be the cause.
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