I'm currently working with mental disorders in very intelligent people.
My last work was on ADHD on gifted children and adults (>98 percentile). We found a higher rate than expected among the gifted of self reported and teacher reported symptoms of ADHD both in adults and children. Also several minor physical anomalies were found to be associated with those cases. The original work is in my master's dissertation available at USP library and the article is soon to be published.
Please check: www.institutosdnd.org