TY  - RPRT
TI  - Another look at early-pregnancy classes.
AU  - J U Bretschneider
AU  - A C Minetola
DO  - 10.1097/00005721-198307000-00007
UR  - https://pubmed.ncbi.nlm.nih.gov/6412020/
ID  - 6412020
ER  -