1. National Institute for Health and Care Excellence. Ectopic pregnancy and miscarriage: diagnosis and initial management. 2012. http://www.nice.org.uk/guidance/cg154/chapter/1-recommendations . Accessed 28 Dec 2015.
2. Suzumori N, Sugiura-Ogasawara M. Genetic factors as a cause of miscarriage. Curr Med Chem. 2010;17:3431–7.
3. Osmana ao lu MA, Erdo an I, Emina ao lu S, Karahan SC, Ozgün S, Can G. The diagnostic value of beta-human chorionic gonadotropin, progesterone, CA125 in the prediction of abortions. J Obstet Gynaecol. 2010;30:288–93.
4. Aleman A, Althabe F, Belizan J, Bergel E. Bed rest during pregnancy for preventing miscarriage. Cochrane Database Syst Rev. 2005;2:CD003576.
5. Harrison RF. A comparative study of human chorionic gonadotropin, placebo, and bed rest for women with early threatened abortion. Int J Fertil Menopausal Stud. 1993;38(3):160–5.