title: Comment: Addressing the Need for Portability in Big Data Model Building and Calibration.
authors.affiliation: Department of Biomedical Informatics, Harvard Medical School, Boston, MA 02115.
authors.forename: Chirag J
authors.initials: CJ
authors.lastname: Patel
authors.affiliation: Department of Biostatistics, Harvard School of Public Health, Boston, MA 02115.
authors.forename: Francesca
authors.initials: F
authors.lastname: Dominici