1. Private Practice, Specialist Orthodontic Practice, Mierzyn, Poland
2. Department of Dental Prophylaxis and Experimental Dentistry, Collegium Medicum of Jagiellonian University, Cracow, Poland
3. Private Practice, Individual Dental Practice, Grudziądz, Poland
4. 5th Military Research Hospital and Independent Public Healthcare Centre Polyclinic, Cracow, Poland
5. Specialist Unit of Orthodontics, District Outpatient Clinic Zbigniew Żak Memorial, Cracow, Poland