Office of Law Enforcement Standards, National Institute of Standards and Technology, 100 Bureau Drive, STOP 8102, Gaithersburg, MD 20899-8102, USA;
Bureau of Alcohol, Tobacco, Firearms and Explosives, 6000 Ammerdale Rd, Ammerdale, MD 20705, USA;
Molecular Spectrometry and Microfluidic Methods Group, Analytical Chemistry Division, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD 20899-8394, USAApplied Biosystems, Human Identity Group, 850 Lincoln Centre Drive, Foster City, CA 94404, USA;