Trisomy clusters.
D003120:Colorado; D004314:Down Syndrome / Q000453:epidemiology*; D005260:Female; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D012621:Seasons; D012729:Sex Chromosome Aberrations / Q000453:epidemiology*; D013029:Space-Time Clustering; D014314:Trisomy; D014960:X Chromosome