41.   A pamphlet available to visitors says it is now believed that depression is the sign of a chemical imbalance in brain.

42.   Chemical imbalances may occur due to certain stimuli from the environment.

43.   Causes include stress, fatigue, illness, head injury, stroke, drug use, drug withdrawal or a chemical imbalance.

44.   Sufferers of obsessive-compulsive disorder now have a third drug option to fight the disease, believed to be caused by a chemical imbalance in the brain.