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. 1972 Dec 16;2(7790):1294.
doi: 10.1016/s0140-6736(72)92660-8.

Instrument for measuring the available diameter of the internal cervical os

F D Johnstone, I E Boyd, J C Browne

Instrument for measuring the available diameter of the internal cervical os

F D Johnstone et al. Lancet. .
No abstract available

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