1. Laboratory of Polymer Chemistry; Department of Chemistry; A.I. Virtasen Aukio 1, P.O. Box 55, 00014 University of Helsinki; Finland
2. Faculté de Pharmacie et Département de Chimie, Université de Montréal; CP 6128 Succursale Centre Ville Montréal Québec H3C 3J7 Canada
3. International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS); 1-1 Namiki, Tsukuba, Ibaraki 305-0044 Japan