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Figure 1 The one-day, three-acquisition protocol of fluorine-18 fluoro-2-deoxyglucose (FDG)-positron emission tomography (PET) for fasting and oral glucose loading. Images after overnight fasting (PET 1) and after oral glucose loading (PET 3) were acquired serially on the same day. The image for subtraction (PET 2) was acquired just before the second injection of FDG.