1. National Measurement Laboratory: Centre of Excellence in Agriculture and Food Integrity, Institute for Global Food Security, School of Biological Sciences, Queen’s University Belfast, Belfast BT9 5DL, U.K.
2. SafetySpect Incorporated, Grand Forks, North Dakota 58202, United States
3. Biomedical Engineering Program, University of North Dakota, Grand Forks, North Dakota 58202, United States