Shayegani, R., Song, K., Amuan, M., Jaramillo, C., Eapen, B., & Pugh, M. Patterns of zolpidem use among Iraq and Afghanistan veterans: A retrospective cohort analysis. PloS One, 13(1), e0190022. https://doi.org/10.1371/journal.pone.0190022 (Original work published 2018)