Henderson Family, 18p-, Canada
Maass Family, 18q-, Germany
Brochier Martinez Family, Tetrasomy 18p
Tracey Family, Ring 18, Australia
Gonzalez Family, Trisomy 18, Texas Area
Freeman Family, 18q-, Great Plains
Hemmasi Family, Trisomy 18, Texas Area
Lutton Family, Trisomy 18, Australia
DeMarco Family, 18p-, Southwest
Stroud Family, 18q-, Canada
Lems Family, 18q-, Rocky Mountain
Fidler Family, Tetrasomy 18p, Southwest
Hammond Family, 18q-, UK
Sandou Family, Trisomy 18, Texas Area
Plancon Family, Tetrasomy 18p, France