[1] MASSACHUSETTS GEN HOSP, DAY NEUROMUSCULAR RES LAB, BOSTON, MA 02129 USA
[2] MASSACHUSETTS GEN HOSP, MOLEC NEUROGENET LAB, BOSTON, MA 02129 USA
[3] MIT, HOWARD HUGHES MED INST, CAMBRIDGE, MA 02139 USA
[4] ELEANOR ROOSEVELT INST CANC RES, DENVER, CO USA
[5] ROBERT WOOD JOHNSON MED SCH, DEPT MOLEC GENET & DENT NEW JERSEY, PISCATAWAY, NJ USA