Stanford Medical Informatics, School of Medicine, Stanford University, Stanford, CA 94305, USA. nigam@stanford.edu|Stanford Medical Informatics, School of Medicine, Stanford University, Stanford, CA 94305, USA. nigam@stanford.edu|Stanford Medical Informatics, School of Medicine, Stanford University, Stanford, CA 94305, USA. nigam@stanford.edu|Stanford Medical Informatics, School of Medicine, Stanford University, Stanford, CA 94305, USA. nigam@stanford.edu|Stanford Medical Informatics, School of Medicine, Stanford University, Stanford, CA 94305, USA. nigam@stanford.edu