1. Department
of Biomedical Engineering, University of Michigan, 1101 Beal Avenue, Ann Arbor, Michigan 48109, United States
2. Department
of Pharmaceutics and Industrial Pharmacy, Faculty of Pharmacy, Suez Canal University, Ismailia 415-22, Egypt
3. Macromolecular
Science and Engineering Program, University of Michigan, 2300 Hayward
Avenue, Ann Arbor, Michigan 48109, United States