title: Neonatal screening for phenylketonuria. 3. Altered sex ratio; extent and possible causes.
mesh_terms: D000367:Age Factors; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007231:Infant, Newborn; D007232:Infant, Newborn, Diseases / Q000175:diagnosis*; D008297:Male; D008403:Mass Screening; D010649:Phenylalanine / Q000097:blood; D010661:Phenylketonurias / Q000175:diagnosis* / Q000453:epidemiology; D011635:Public Health Administration; D012044:Regression Analysis; D012737:Sex Factors; D011795:Surveys and Questionnaires; D014481:United States
chemical_list: D010649:Phenylalanine