Ruud H. Deurenberg , Eric Nulens, Havard Valvatne, Silvie Sebastian, Christel Driessen, Jos Craeghs, Els De Brauwer, Bernhard Heising, Yvette J. Kraat, Joachim Riebe, Frans S. Stals, Thera A. Trienekens, Jacques Scheres, Alexander W. Friedrich, Frank H. Van Tiel, Patrick S. Beisser, and Ellen E. Stobberingh

Author affiliations: University Hospital Maastricht, Maastricht, the Netherlands (R.H. Deurenberg, H. Valvatne, S. Sebastian, C. Driessen, J. Scheres, F.H. van Tiel, P.S. Beisser, E.E. Stobberingh); General Hospital Sint-Jan, Brugge, Belgium (E. Nulens); General Hospital Vesalius, Tongeren, Belgium (J. Craeghs); Atrium Medical Center, Heerlen, the Netherlands (E. De Brauwer); General Hospital Düren, Düren, Germany (B. Heising); Orbis Medical and Care Center, Sittard, the Netherlands (Y.J. Kraat); Laboratory Aachen, Aachen, Germany (J. Riebe); Laurentius Hospital, Roermond, the Netherlands (F.S. Stals); VieCuri Medical Center, Venlo, the Netherlands (T.A. Trienekens); University of Münster, Münster, Germany (A.W. Friedrich)