1. Laboratorium of Experimental Medicine and Endocrinology (LEGENDO) (D.V., E.V.H., R.B., Onderwijs en Navorsing, Gasthuisberg, B-3000 Leuven, Belgium
2. Unit of Reumatology (J.N.), University Hospital Gasthuisberg, B-3000 Leuven, Belgium
3. Department of Endocrinology (E.A.), B-2340 Beerse, Belgium
4. Scientific Development Group, NV Organon, NL-5340 BH Oss, The Netherlands; and the Janssen Research Foundation (R.D.C.), B-2340 Beerse, Belgium