1. Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology , University of Arkansas for Medical Sciences , Little Rock , AR , USA
2. Department of Pediatrics, Arkansas Children’s Research Institute , University of Arkansas for Medical Sciences , Little Rock , AR , USA
3. Department of Biostatistics , University of Arkansas for Medical Sciences , Little Rock , AR , USA
4. Institute for Diabetes Research and Metabolic Diseases of the Helmholtz Center Munich at the University of Tübingen , German Center for Diabetes Research (DZD) , Tübingen , Germany