1. Department of Chemistry & Biochemistry, Stephen F. Austin State University, Box 13006-SFA Station, Nacogdoches, Texas, 75962-3006, USA
2. Texas Department of Public Safety, Breath Alcohol Laboratory, 5805 N. Lamar Blvd, Austin TX, 78752, USA
3. Texas Department of Public Safety, Lufkin Office, Breath Alcohol Laboratory, 2809 S John Redditt Dr Lufkin, TX 75904, USA