1. Division of Pharmaceutical Analysis, Office of Testing and Research, Center for Drug Evaluation and Research, U.S. Food and Drug Administration, Silver Spring, MD, USA
2. Center for Biomedical Mass Spectrometry Research, Medical College of Wisconsin, Milwaukee, WI, USA
3. Biomolecular Measurement Division, National Institute of Standards and Technology, Institute for Bioscience and Biotechnology Research, Rockville, MD, USA
4. Office of Lifecycle Drug Products, Office of Pharmaceutical Quality, Center for Drug Evaluation and Research, U.S. Food and Drug Administration, Silver Spring, MD, USA
5. COUR Pharmaceuticals Development Company, Northbrook, IL, USA