1. The University of Akron, Akron, OH 44325‐3909, USA
2. Nanocopoeia, Inc., St. Paul, MN 55104, USA
3. Division of Surgical Research, Summa Health System, Akron, OH 44304, USA
4. Characterization Facility, University of Minnesota, 12 Shepherd Labs, 100 Union St. SE, Minneapolis, MN 55455, USA