[1] MASSACHUSETTS GEN HOSP, NEUROGENET LAB, BOSTON, MA 02115 USA
[2] UNIV HELSINKI, DEPT MED GENET, SF-00290 HELSINKI 29, FINLAND
[3] VAESTOLIITTO, DEPT MED GENET, SF-00100 HELSINKI, FINLAND
[4] CLIN RES CTR, ENDOCRINOL RES GRP, HARROW HA1 3UJ, MIDDX, ENGLAND
[5] CHILDRENS HOSP MED CTR, DIV GENET, BOSTON, MA 02115 USA
[6] HARVARD UNIV, SCH MED, NEUROSCI PROGRAM NEUROL, BOSTON, MA 02115 USA
[7] NIMH, CLIN SCI LAB, BETHESDA, MD 20892 USA