11.   Their discovery marks the first time circadian rhythm genes have been implicated in a behavioral disorder.

12.   They are shooting, and being shot, using drugs and being medicated for behavioral disorders, far more than their sisters.

13.   This is the first time that circadian rhythm genes have been implicated in a behavioral disorder.

14.   High levels of lead in the blood can cause reduced intelligence, behavioral disorders and other problems in children.

15.   This may in turn help to reduce the incidence of behavioral disorders, Sartono suggested.