[4] Jensterle M, Salamun V, Kocjan T, Vrtacnik Bokal E, Janez A: Short term monotherapy with GLP-1 receptor agonist liraglutide or PDE 4 inhibitor roflumilast is superior to metformin in weight loss in obese PCOS women: a pilot randomized study. J Ovarian Res. 2015, 8:32. 10.1186/s13048-015-0161-3. This evidence concerns the gene GLP1R and polycystic ovary syndrome.