3McQueen MJ. Overview of evidence-based medicine:challenges for evidence-based laboratory medicine. Clin Chem,2001,47:1536-1546.
4Wong ET. Improving laboratory testing: can we get physicians to focus on outcome? Clin Chem, 1995, 41:1241-1247.
5Lundberg GD. Changing physician behavior in ordering diagnostic tests. JAMA,1998,280:2036.
6Boone DJ , Steindel SJ. Conducting outcomes research: past experience and future directions. Clin Chem, 1995,41:795-798.
7Cole LA. Immunoassay of human chorionic gonadotropin, its free subunits, and metabolites.Clin Chem, 1997,43:2233-2243.
8Birken S,Berger P,Bidart JM, et al. Preparation and characterization of new WHO reference reagents for human chorionic gonadotropin and metabolites. Clin Chem,2003,49:144-154.
9van Walraven C,Naylor CD. Do we know what inappropriate laboratory utilization is? A systematic review of laboratory clinical audits. JAMA, 1998,280:550-558.
