title: [Blood groups systems of children participating in a longitudinal follow-up study: a strange serendipity (author's transl)].
mesh_terms: D001789:Blood Group Antigens / Q000235:genetics*; D002648:Child; D002677:Chile; D005260:Female; D005787:Gene Frequency; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D012737:Sex Factors
chemical_list: D001789:Blood Group Antigens
vernacular_title: Grupos sanguíneos en escolares de un estudio longitudinal: un extraño serendipismo.