<qa>  What is the name of the group that is eligible for this study?If you are found to be eligible to take part in this study, you will be randomly assigned as in the roll of dice to receive either metformin or a placebo. This is done because no one knows if one study group is better, the same, or worse than the other group. For every 7 participants enrolled in this study, 6 will receive metformin and 1 will receive a placebo. 