[1] Childrens Hosp, Dept Neurosurg, Boston, MA 02115 USA
[2] Childrens Hosp, Neurobiol Program, Boston, MA 02115 USA
[3] Massachusetts Eye & Ear Infirm, Angiogenesis Lab, Boston, MA 02114 USA
[4] Harvard Univ, Sch Med, Dept Ophthalmol, Boston, MA 02115 USA
[5] Harvard Univ, Sch Med, Dept Surg, Boston, MA 02115 USA
[6] Harvard Univ, Sch Med, Program Neurosci, Boston, MA 02115 USA