RT Journal Article SR Electronic T1 A Critical Examination of the Reputed Primary Influence of ABO Phenotype on Fertility and Sex Ratio JF British Journal of Preventive & Social Medicine JO Br J Prev Soc Med FD BMJ Publishing Group Ltd SP 79 OP 89 DO 10.1136/jech.11.2.79 VO 11 IS 2 A1 J. H. Edwards YR 1957 UL http://jech.bmj.com/content/11/2/79.abstract AB