1. Department of Endocrinology, Metabolism and Internal Medicine, Poznan University of Medical Sciences, Poznan, Poland
2. Institute of Human Genetics, Polish Academy of Sciences, Poznan, Poland
3. Ludwik Perzyna Regional Hospital, Kalisz, Poland
4. Regional Outpatient Medical Centre, Katowice, Poland
5. Department of Paediatric Diabetes and Obesity, Poznan University of Medical Sciences, Poznan, Poland