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(A) correlation between evening hypoxia inducible factor (HIF)-1α protein level and apnea-hypopnea index (AHI; events/h). (B) Level between morning HIF-1α protein level and AHI (events/h). (C) Correlation between evening HIF-1α protein level and body mass index (BMI). (D) Correlation between morning HIF-1α protein level and BMI.
