Receptors, GlucagonPostprandial PeriodPhilippinesHypoglycemic AgentsPeptidesHemoglobin A, GlycosylatedGastric EmptyingSulfonylurea CompoundsHypoglycemiaC-PeptideGlucagon-Like Peptide 1MetforminDiabetes Mellitus, Type 2Republic of KoreaBlood GlucoseDouble-Blind MethodGlucagonDrug Administration ScheduleDrug ResistanceDose-Response Relationship, DrugTreatment Outcome