1. Abbott Laboratories: package insert for progesterone on AxSym;Anonymous,1996
2. ACOG Practice Bulletin No. 31: Assessment of Risk Factors for Preterm Birth
3. College of American Pathologists. Y-B ligands (special) survey;Anonymous,2008
4. Diagnostic Products Corporation: package insert for Coat-A-Count DHEA kit;Anonymous,1992
5. Diagnostic Products Corporation: package insert for Coat-A-Count progesterone kit;Anonymous,1997