TY  - RPRT
TI  - Birthing Sphere.
AU  - Peter Walker
AU  - Susan Purdin
PY  - 2004
DO  - 10.1111/j.0361-3666.2004.00246.x
UR  - https://pubmed.ncbi.nlm.nih.gov/15186358/
ID  - 15186358
ER  -