TY - JOUR AU - Susan Tai AU - Bei Xu AU - Lorna Sniegoski AU - Michael Welch C2 - Analytical Chemistry DA - 2006-11-01 LA - en M1 - 78 PB - Analytical Chemistry PY - 2006 TI - Development and Evaluation of a Reference Measurement Procedure for the Determination of 19-Norandrosterone in Human Urine Using Isotope-Dilution Liquid Chromatography-Tandem Mass Spectrometry ER -