Chuang, M., Yang, Y., Tsai, Y., Hsieh, M., Lin, Y., Lin, C., … Yang, T. Survival benefit associated with metformin use in inoperable non-small cell lung cancer patients with diabetes: A population-based retrospective cohort study. PloS One, 13(1), e0191129. https://doi.org/10.1371/journal.pone.0191129 (Original work published 2018)