TY  - RPRT
TI  - Measuring time to pregnancy. Methodological issues to consider.
AU  - J Olsen
AU  - S Juul
AU  - O Basso
PY  - 1998
DO  - 10.1093/humrep/13.7.1751
UR  - https://pubmed.ncbi.nlm.nih.gov/9740411/
ID  - 9740411
ER  -