1. Nutrition Obesity Research Center, University of Alabama at Birmingham, Birmingham, AL, USA
2. Department of Pediatrics, University of Alabama at Birmingham, Birmingham, AL, USA
3. Department of Mathematical Sciences, Indiana University-Purdue University Indianapolis, Indianapolis, IN, USA
4. Department of Epidemiology and Prevention, Wake Forest University School of Medicine, Winston Salem, NC, USA
5. Department of Epidemiology, University of Alabama at Birmingham, Birmingham, AL, USA
6. Division of Preventive Medicine, Department of Medicine, University of Alabama at Birmingham, Birmingham, AL, USA