Affiliation: | (1) Department of Medical Genetics, Free University of Brussels, rue aux Laines 97, B-1000 Bruxelles, Belgium;(2) Institute of Morphology, F. U. B., rue aux Laines 97, B-1000 Bruxelles, Belgium;(3) Department of Human genetics, F. U. B., B-1000 Bruxelles, Belgium;(4) Institute of Morphology, F. U. B., rue aux Laines 97, B-1000 Bruxelles, Belgium |