Research Article

ABO blood groups and sex ratio at birth.

Br Med J 1973; 1 doi: https://doi.org/10.1136/bmj.1.5847.236-c (Published 27 January 1973) Cite this as: Br Med J 1973;1:236

This is a PDF-only article. The first page of the PDF of this article appears below.

PDF extract preview