1. Benson RC. Habitual abortion. Calif Med. 1950;72:442–6.
2. The Investigation and Treatment of Couples with Recurrent First trimester and Second-trimester Miscarriage, Royal College of Obstetricians & Gynaecologists RCOG Green-top Guideline No. 17, April 2011.
3. Recurrent Pregnancy Loss, The European Society of Human Reproduction and Embryology, ESHRE Early Pregnancy Guideline Development Group, Version 2, November 2017.
4. Ogasawara M, Aoki K, Okada S, Suzumori K. Embryonic karyotype of abortuses in relation to the number of previous miscarriages. Fertil Steril. 2000;73:300–4.
5. Regan L. Recurrent miscarriage. BMJ. 1991;302:543–4.