Harvill, Eleanor, Daniel Litwok, Shawn Moulton, Alyssa Rulf Fountain, and Laura R. Peck (2018). Technical supplement to the Health Profession Opportunity Grants (HPOG) impact study interim report: Report appendices, OPRE Report #2018-16b, Washington, DC: Office of Planning, Research, and Evaluation, Administration for Children and Families, U.S. Department of Health and Human Services. Available at https://www.acf.hhs.gov/sites/default/files/images/opre/hpog_interim_appendices_revised_nov_2019.pdf