[1] UNIV BRUSSELS,ST PIERRE HOSP,DEPT MED CHEM,B-1000 BRUSSELS,BELGIUM
[2] UNIV BRUSSELS,ST PIERRE HOSP,HUMAN REPROD UNIT,B-1000 BRUSSELS,BELGIUM
[3] STATE UNIV GHENT,DEPT PEDIAT,B-9000 GHENT,BELGIUM
[4] CATHOLIC UNIV LEUVEN,DEPT PEDIAT,B-3000 LOUVAIN,BELGIUM
[5] CATHOLIC UNIV LOUVAIN,DEPT PEDIAT,B-1200 BRUSSELS,BELGIUM