[1] CHARLES UNIV,FAC PEDIAT MED,DEPT PATHOL,CS-11636 PRAGUE 1,CZECHOSLOVAKIA
[2] CHARLES UNIV,FAC PEDIAT MED,DEPT PEDIAT ONCOL,CS-11636 PRAGUE 1,CZECHOSLOVAKIA
[3] CHARLES UNIV,FAC PEDIAT MED,DEPT OBSTET & GYNAECOL,CS-11636 PRAGUE 1,CZECHOSLOVAKIA
[4] CHARLES UNIV,FAC MED,DEPT OBSTET & GYNAECOL,CS-11636 PRAGUE 1,CZECHOSLOVAKIA