1. Department of Pediatric Otolaryngology, Head and Neck Surgery, Chairs of Pediatric Surgery, The Independent Public Clinical Hospital No. 6 of the Medical University of Silesia in Katowice, John Paul II Upper Silesian Child Health Centre, 40-055 Katowice, Poland
2. Department of Periodontal Diseases and Oral Mucosa Diseases, School of Medicine with the Division of Dentistry in Zabrze, Medical University of Silesia in Katowice, Pl. Traugutta 2, 41-800 Zabrze, Poland