Lajos Lakatos1, György Balla2. 1. Department of Pediatrics, Kenezy Teaching Hospital, Bartók B. str. 2-26, Debrecen, 4031, Hungary. lakatosl@kenezykorhaz.hu. 2. Department of Pediatrics, University of Debrecen, Egyetem tér 1, Debrecen, 4032, Hungary.