Mr. Hau is a 56-year-old male, married with two teenaged children. He is employed as a pharmacist and his wife is a receptionist in a dental office. He has no formal psychiatric history. About three months ago, Binh's personality began to change in subtle ways. Previously an optimistic, outgoing individual, he gradually became serious, irritable and socially withdrawn. His family noticed that he was sleeping poorly, sometimes pacing the house all night. At times he was observed mumbling to himself as if he were conversing with someone who wasn't there. His family grew increasingly concerned.