TY  - RPRT
TI  - Birth positions.
AU  - J K Gupta
AU  - R J Lilford
PY  - 1987
DO  - 10.1016/s0266-6138(87)80058-x
UR  - https://pubmed.ncbi.nlm.nih.gov/3649547/
ID  - 3649547
ER  -