TY  - RPRT
TI  - Multiple pregnancy: a modern epidemic?
AU  - Mark P Umstad
AU  - Michael J Gronow
PY  - 2003
DO  - 10.5694/j.1326-5377.2003.tb05384.x
UR  - https://pubmed.ncbi.nlm.nih.gov/12797847/
ID  - 12797847
ER  -