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Oppositional defiant disorder is reported to affect between 10 percent and 15 percent of children and adolescents in the general population. Oppositional Defiant Disorder caused of environment, genetics, and medical problems.

Oppositional defiant disorder is reported to affect between 10 percent and 15 percent of children and adolescents in the general population. Oppositional Defiant Disorder caused of environment, genetics, and medical problems.

Obsessive compulsive personality disorder, like many other mental illnesses, is linked to genetics and is caused by an imbalance in the person's brain chemistry.

Niemann-Pick disease Types C and D may appear early in life or develop in the teen or adult years. Niemann-Pick. Incidence of Niemann-Pick disease, type C is estimated to be 1 in 150,000 people.

Niemann-Pick disease Types C and D may appear early in life or develop in the teen or adult years. Niemann-Pick. Incidence of Niemann-Pick disease, type C is estimated to be 1 in 150,000 people.

Neurasthenia with the stresses of urbanization and the pressures placed on the intellectual class by the increasingly competitive business environment. Typically, it was associated with upper class individuals in sedentary employment.

Neurasthenia with the stresses of urbanization and the pressures placed on the intellectual class by the increasingly competitive business environment. Typically, it was associated with upper class individuals in sedentary employment.

Narcissistic personality disorder may be an infantile, defensive personality structure in response to abuse and trauma, usually developing in early childhood or early adolescence.

Narcissistic personality disorder may be an infantile, defensive personality structure in response to abuse and trauma, usually developing in early childhood or early adolescence.

The blood contains several different types of cells, each with an important job in the body. The originator of all blood cells is an immature cell known as the stem cell.