American College of Obstetricians and Gynecologists Committee on Practice Bulletins–Obstetrics, Committee of Genetics, and the Society for Maternal–Fetal Medicine: Screening for fetal chromosomal abnormalities: ACOG practice bulletin, number 226 (2020) SOFT (Support Organization for Trisomy 18, 13, and Related Disorders): An organization providing resources, research information, and community and support services to people caring for others who have trisomy 18, 13, or another related chromosome disorder