1 Department of Biomedical Informatics, Harvard Medical School, Boston, Massachusetts; MIT Lincoln Laboratory, Biological and Chemical Technologies Group, Lexington, Massachusetts.
2 Section of Gastroenterology, Evans Department of Medicine, Boston University School of Medicine, Boston, Massachusetts.
3 Department of Biomedical Informatics, Harvard Medical School, Boston, Massachusetts. Electronic address: chirag_patel@hms.harvard.edu.