title: Selection intensities in mothers of twins and in mothers of singletons.
authors.forename: P
authors.initials: P
authors.lastname: Philippe
mesh_terms: D005260:Female; D005298:Fertility; D005787:Gene Frequency; D006801:Humans; D007246:Infertility / Q000453:epidemiology; D009026:Mortality / Q000639:trends; D011792:Quebec; D014427:Twins