Reference:
• Haddow JE, et al. Variability in thyroid-stimulating hormone suppression by human chorionic [corrected] gonadotropin during early pregnancy. J Clin Endocrinol Metab. 2008 Sep;93(9):3341-7.
• Wilcox AJ, Baird DD, Weinberg CR (1999). \"Time of implantation of the conceptus and loss of pregnancy\". New England Journal of Medicine 340 (23): 1796–1799.
• Pregnancy test. [Available at: http://www.early-pregnancy-tests.com/pregnancy-tests.html] Access date 7 Sept 2010.
• Pregnancy test. [Available at: http://www3.ipst.ac.th/research/assets/web/mahidol/hormone(9)/chapter5/placental.htm] Access date 7 Sept 2010.
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