1. 1st Department of Pediatrics, Semmelweis University, 53 Bókay Street, Budapest 1083, Hungary
2. 1st Department of Medicine, Semmelweis University, Korányi S. Street 26A, Budapest 1083, Hungary
3. 2nd Department of Medicine, University of Debrecen, Nagyerdei Körút 98, Debrecen 4032, Hungary