1. Laboratory of Experimental Medicine and Endocrinology (C.A.G., H.C., A.G., R.B., C.M.), Katholieke Universiteit Leuven, 3000 Leuven, Belgium
2. Laboratory of Experimental Medicine (A.K.C., D.L.E.), Université Libre de Bruxelles, 1070 Brussels, Belgium
3. Laboratory for Clinical Chemistry (L.H.), Katholieke Universiteit Leuven, 3000 Leuven, Belgium