1. Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
2. Department of Macromolecular Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109, United States
3. BASF Corporation, 1609 Biddle Avenue, Wyandotte, Michigan 48192, United States
4. Biointerfaces & Delivery Systems, BASF SE, Carl-Bosch-Strasse 38, Ludwigshafen D-67056, Germany
5. Material Physics, BASF SE, RAA/OS − B007, Carl-Bosch-Strasse 38, Ludwigshafen D-67056, Germany