TY  - RPRT
TI  - Probabilities for singleton and multiple pregnancies after in vitro fertilization.
AU  - P M Martin
AU  - H G Welch
PY  - 1998
DO  - 10.1016/s0015-0282(98)00220-9
UR  - https://pubmed.ncbi.nlm.nih.gov/9757876/
ID  - 9757876
ER  -