1. Polymer Reaction Design group; Institute for Materials Research; Universiteit Hasselt, Martelarenlaan 42 B-3500 Hasselt Belgium
2. Department of Physiology; Maastricht University; PO Box 616 6200 MD Maastricht The Netherlands
3. Polymer Reaction Design group; School of Chemistry; Monash University; 19 Rainforest Walk Clayton VIC 3800 Australia