1. Analytical Sciences, DuPont Experimental Station, 200 Powder Mill Rd, Wilmington, Delaware 19803, United States
2. Engineering Technology Center, DuPont Chestnut Run Plaza, Wilmington, Delaware 19805, United States
3. Engineering Technology Center, DuPont Specialty Products GmbH & Co. KG, Industriestraße 1, D-77836 Rheinmünster, Germany
4. Engineering Technology Center, DuPont de Nemours (Deutschland) GmbH, Hugenottenallee 175, D-63263 Neu-Isenburg, Germany