1 Department of Preventive Medicine and Education, Medical University of Gdańsk, Gdańsk, Poland; Department of Dental Techniques and Masticatory System Dysfunctions, Medical University of Gdańsk, Gdańsk, Poland
2 Department of Pediatrics, Nephrology and Hypertension, Medical University of Gdańsk, Gdańsk, Poland
3 Mental Health Clinic for Children and Adolescents, Gdansk Medical Centre, Gdańsk, Poland
4 Department of Trauma and Orthopedic Surgery, Medical University of Gdańsk, Gdańsk, Poland
5 Department of Pediatric Cardiology and Congenital Heart Disease, Medical University of Gdańsk, Gdańsk, Poland
6 Department of Periodontology and Oral Mucosal Diseases, Medical University of Gdańsk, Gdańsk, Poland
7 Department of Nephrology, Transplantation Medicine and Internal Diseases, Medical University of Gdańsk, Gdańsk, Poland
8 Department of Preventive Medicine and Education, Medical University of Gdańsk, Gdańsk, Poland. tz@gumed.edu.pl