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J Obstet Gynaecol Br Commonw
; 81(7): 571-4, 1974 Jul.
Article
in English
| MEDLINE
| ID: mdl-4407899
2.
Postgrad Med J
; 44(516): 803-6, 1968 Oct.
Article
in English
| MEDLINE
| ID: mdl-5705388