1. Clinical Research Centre, Medical University of Bialystok, Bialystok, Poland
2. Department of Reproduction and Gynaecological Endocrinology, Medical University of Bialystok, Bialystok, Poland
3. Department of Endocrinology, Diabetology and Internal Medicine, Medical University of Bialystok, Bialystok, Poland
4. Centre for Metabolomics and Bioanalysis (CEMBIO), Facultad de Farmacia, Universidad CEU San Pablo, Madrid, Spain