Bipolar disorders affect up to 3% of the world's population and are the 6th leading cause of disability worldwide. The estimated annual costs of bipolar disorder approach $50 billion in the United States, and the associated societal and personal suffering is immeasurable. Bipolar disorder is a lifelong illness that typically begins in mid-adolescence, thereby disrupting healthy developmental processes. It is also a progressive illness, making early intervention even more critical. As the disorder presents differently in youth as it does in adults, considerable controversy exists around the...