After being informed about the study and potential risks, all patients will give written informed consent and undergo a 1 day screening period to determine the eligibility for study entry. At day 0, patients who meet the eligibility requirements will be randomized in a double blind (participant and investigator) in a 1:1 ratio to metformin glycinate (620 mg, taken orally twice daily) plus standard treatment or placebo (taken orally,twice daily) plus standard treatment, both will be for 14 days.
