<qa>  What is the goal of the study?A better understanding of the nature and correlates of diabetic complications is crucial in the fields ongoing efforts in improving the care and welfare of schizophrenic patients. In addition, diabetes and X-syndrome associated with antipsychotics andor schizophrenia also may represent a unique opportunity for understanding the pathogenesis and management of diabetes in general. It also could be potentially a particularly effective model for studying gene-environment interactions that are crucial for understanding most common human diseases. Ultimately, our goal is to develop genetic tests to predict therapeutic responses. As such, from the view of a national health economy, this study may prove that personalized medicine saves money. 