1. Department and Laboratory of Intensive Care Medicine (G.V.d.B., M.S., D.V., D.M.), Catholic University of Leuven, B-3000 Leuven, Belgium
2. Department of General Internal Medicine (Medical Intensive Care Unit) (G.H., A.W.), Catholic University of Leuven, B-3000 Leuven, Belgium
3. Laboratory of Experimental Medicine and Endocrinology (R.B.), Catholic University of Leuven, B-3000 Leuven, Belgium