[1] Catholic Univ Louvain, Dept Pediat Haematol & Oncol, St Luc Univ Hosp, B-1200 Brussels, Belgium
[2] Catholic Univ Louvain, Ctr Human Genet, St Luc Univ Hosp, B-1200 Brussels, Belgium
[3] Catholic Univ Louvain, Dept Pediat Endocrinol, St Luc Univ Hosp, B-1200 Brussels, Belgium
[4] Catholic Univ Louvain, Dept Pathol, St Luc Univ Hosp, B-1200 Brussels, Belgium