References
- National Perinatal Statistics Unit. 1990, Fertility Society of Australia. IVF and GIFT pregnancies, Australia and New Zealand, 1988
- Medical Research Council Working Party on Children Conceived by In Vitro Fertilisation. Births in Great Britain resulting from assisted conception, 1978–87. Br Med J 1990; 300: 1229–33
- Medical Research International, Society for Assisted Reproductive Technology. The American Fertility Society. In vitro fertilization‐embryo transfer (IVF‐ET) in the United States: 1989 results from the IVF‐ET Registry. Fertil Steril 1991; 55: 14–23