[1] Univ Calif Los Angeles, Sch Med, Dept Neurol, Los Angeles, CA 90024 USA
[2] Univ Calif Los Angeles, Sch Med, Dept Lab Med, Los Angeles, CA USA
[3] Univ Calif Los Angeles, Sch Med, Dept Pediat, Los Angeles, CA 90024 USA
[4] Univ Calif Los Angeles, Sch Med, Dept Psychiat, Los Angeles, CA 90024 USA
[5] Harbor UCLA Med Ctr, Los Angeles, CA USA
[6] Univ Heidelberg, Inst Human Genet, Heidelberg, Germany
[7] CNR, Int Inst Genet & Biophys, I-80125 Naples, Italy