During the past several decades, interest in children's psychological disorders has grown steadily within the research community, resulting in a burgeoning knowledge base. The majority of the attention and funding, not surprisingly, has focused on the more prevalent and well-known conditions. Although this raises the odds that young people with more well-known disorders such as ADHD, autism, and learning disorders will receive much-needed professional assessment and intervention, children with less frequently encountered disorders may experience a higher risk of misdiagnosis and...