Diagnosing psychiatric and neurological conditions is tricky. Physicians have long reported that diagnoses are fraught with complications and subtleties. Anywhere from 35 percent to 85 percent of mental health conditions go undetected and undiagnosed, according to the World Health Organization, depending on where you live in the world. Needless to say, in order to treat depression, Alzheimer's, or autism, it must first be detected.

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