TY  - RPRT
TI  - Umbilical cord knots.
AU  - T Sørnes
PY  - 2000
DO  - 10.1080/j.1600-0412.2000.079003157.x
UR  - https://pubmed.ncbi.nlm.nih.gov/10716294/
ID  - 10716294
ER  -