Dental status and oral hygiene in children aged 6-7 and 11-12 from Szczecin, Poland - Barczak, Katarzyna; Witek, Agnieszka; Palczewska-Komsa, Mirona P.; Buczkowska-Radlińska, Jadwiga; Chamarczuk, Agnieszka (Journal of Stomatology, 2020)