Department of Medicine, Stanford University School of Medicine, Stanford, CA 94305, USA.|Institute for Computational Health Sciences, University of California San Francisco, San Francisco, CA 94158, USA.|Institute for Computational Health Sciences, University of California San Francisco, San Francisco, CA 94158, USA.|Department of Medicine, Stanford University School of Medicine, Stanford, CA 94305, USA.|Northrop Grumman Information Technology Health Solutions, Rockville, MD 20850, USA.|Institute for Computational Health Sciences, University of California San Francisco, San Francisco, CA 94158, USA.