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. Author manuscript; available in PMC: 2019 Jul 26.
Published in final edited form as: Oral Oncol. 2018 Jun 30;84:12–19. doi: 10.1016/j.oraloncology.2018.06.022

Fig. 1.

Fig. 1

Cohort Derivation. Abbreviations: SEER, Surveillance, Epidemiology, and End Results; HNC, head and neck cancer; DM, diabetes mellitus; nD, non-diabetic; DnM, diabetic not taking metformin; D + M diabetic taking metformin.