1. Process Research and Development, Merck & Co., Inc., P.O. Box 2000, Rahway, New Jersey 07065, United States
2. Department of Chemistry (retired), University of California Davis, Davis, California 95616, United States
3. Retired, Waxahachie, Texas 75165, United States
4. Department of Biochemistry and Molecular Biology, Indiana University Purdue University Indianapolis, Indianapolis, Indiana 46202, United States
5. PID Analyzers, LLC, Sandwich, Massachusetts 02563, United States
6. Risk Management and Safety, Auburn University, Auburn, Alabama 36849, United States