TY - JOUR AU - Susan Tai AU - Bei Xu AU - Michael Welch C2 - Analytical Chemistry DA - 2006-09-01 LA - en M1 - 78 No 18 PB - Analytical Chemistry PY - 2006 TI - Development and Evaluation of a Candidate Reference Measurement Procedure for the Determination of Progesterone in Human Serum Using Isotope-Dilution Liquid Chromatography-Tandem Mass Spectrometry ER -