1. Technology Innovation, Labopharm, 480 Armand-Frappier, Laval (Québec), H7V 4B4, Canada, Canada Research Chair in Drug Delivery, Faculty of Pharmacy, University of Montreal, C.P. 6128, Succ. Centre-Ville, Montréal (Québec), H3C 3J7, Canada, and Polymer Centre, Department of Chemistry, University of Sheffield, Sheffield, S3 7HF, U.K.