Based on estimates by National Institute of Child Health & Human Development "Down syndrome rates". Archived from the original on 2006-09-01. பார்க்கப்பட்ட நாள் 2006-06-21.
web.archive.org
Based on estimates by National Institute of Child Health & Human Development "Down syndrome rates". Archived from the original on 2006-09-01. பார்க்கப்பட்ட நாள் 2006-06-21.