1. Department of Pediatrics, Diabetology, Endocrinology and Nephrology Medical University of Łódź, Sporna Str. Łódź Poland
2. Department of Pediatrics, Oncology and Hematology Medical University of Łódź, Sporna Str. Łódź Poland
3. Department of Clinical Genetics Medical University of Łódź
4. Department of Children's Diabetology John Paul II Upper Silesian Child Health Centre 40‐752 Katowice Medyków Poland
5. Department of Biostatistics and Translational Medicine Medical University of Łódź
6. Department of Children's Diabetology Medical University of Silesia, 40‐752 Katowice Medyków Poland