A lot of mental disorders occur in childhood or adolescence. Not only schizophrenia and bipolar disorder, neurotic disorders, such as obsessive compulsive disorder, social anxiety disorder, and eating disorders are also likely to occur during adolescent or youngadulthood. Methods for precise diagnosis and treatment for their diseases are developing, but not have been adequately established yet. For example, bipolar disorder is a chronic disease whose onset occurs in adolescence, but is often misdiagnosed . Finding biomarkers, such as Brain-Derived Neurotrophic Factor (BDNF) for major depressive disorders , and utilizing them to diagnose patients rapidly, and give them a tailor-made treatment are desired.