Ji. Tay et al., TWIN PREGNANCY FOLLOWING IVF TREATMENT USING FROZEN-THAWED RETROGRADEEJACULATED SPERM, Journal of assisted reproduction and genetics, 13(9), 1996, pp. 731-732
Freezing retrograde ejaculated semen retrieved from a non-alkalinized
urine sample enabled the successful outcome of NF treatment in a patie
nt with mild congenital spina bifida.