[1] Univ Calif San Francisco, Dept Anat, WM Keck Fdn Ctr Integrat Neurosci, San Francisco, CA 94143 USA
[2] Univ Calif San Francisco, Dept Physiol, San Francisco, CA 94143 USA
[3] Massachusetts Gen Hosp, Dept Anesthesia & Crit Care, Neural Plast Res Grp, Boston, MA 02129 USA
[4] Harvard Univ, Sch Med, Boston, MA 02129 USA