Ineke Aarts
Joan Guthrie Medlen
National Down Syndrome Society (U. S.)
Marjorie Beeghly
Christopher Kliewer
National Down Syndrome Society Conference on Morphogenesis and Down Syndrome (1991 New York, N.Y.)
Charles J. Epstein
International Down Syndrome Research Conference (1994 Charleston, S.C.)
National Down Syndrome Society (U.S.). Symposium
B. Shepperdson
J. A. Rondal