1. Department of Computing and Mathematical Sciences, California Institute of Technology 1 , Pasadena, California 91125, USA
2. Division of Endocrinology, Metabolism and Diabetes, Department of Medicine, School of Medicine, University of Colorado Anschutz Medical Campus 2 , Aurora, Colorado 80045, USA
3. Department of Biomedical Informatics, School of Medicine, University of Colorado Anschutz Medical Campus 3 , Aurora, Colorado 80045, USA