The Changing Epidemiology of Neural Tube Defects, United STates, 1968-1989
Am J Dis Child 146:857-861, Yen,I.H.,et al, 1992
Fibrodysplasia Ossificans Progressiva, The Clinical Features & Natural Hx of 34 Pts
J Bone Joint Surg 64B:76-83, Connor,J.M.&Evans,D.A.P., 1982