Published on in Vol 6, No 4 (2018): Oct-Dec
                                    Preprints (earlier versions) of this paper are
                                    available at
                                    https://preprints.jmir.org/preprint/10870, first published
                                    .
                                

1 The MITRE Corporation, Bedford, MA, United States
2 AEGIS.net, Inc, Rockville, MD, United States
3 The Office of the National Coordinator for Health Information Technology, US Department of Health and Human Services, Washington, DC, United States
