1. Zernike Institute for Advanced Materials, University of Gronigen, Nijenborgh 4, 9747
AG Groningen, The Netherlands
2. Stichting Fundamenteel Onderzoek der Materie, P.O. Box 3021, 3502 GA Utrecht, The Netherlands
3. Dutch Polymer Institute, P.O. Box 902, 5600 AX Eindhoven, The Netherlands