1. Department of Pharmaceutical Sciences, College of Pharmacy, University of Kentucky, Lexington, KY 40536-0082, USA
2. Pharmaceutical & Analytical Department, Novartis Pharmaceutical Corporation, East Hanover, NJ 07936-1080, USA
3. UNC Lineberger Comprehensive Cancer Center, UNC-Chapel Hill, Chapel Hill, NC 27599-7295, USA; Division of Molecular Pharmaceutics, Center for Nanotechnology in Drug Delivery, UNC Eshelman School of Pharmacy, 1044 Genetic Medicine Building, CB 7362, 120 Mason Farm Road, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-7362, USA.