[1] Univ Debrecen, Dept Paediat, Med Hlth Sci Ctr, H-4012 Debrecen, Hungary
[2] Univ Debrecen, Dept Obstet, Med Hlth Sci Ctr, H-4012 Debrecen, Hungary
[3] Royal Manchester Childrens Hosp, Dept Paediat Surg, Manchester M13 9WL, Lancs, England
[4] Hetenyi Geza Cty Hosp, Dept Obstet, H-5000 Szolnok, Hungary
[5] Josa Andras Cty Hosp, Dept Obstet, H-4400 Nyiregyhaza, Hungary