[1] Univ North Carolina, Chapel Hill, NC 27515 USA
[2] Univ Arizona, Dept Psychol, Tucson, AZ 85721 USA
[3] Univ North Carolina, Dept Neurol, Sch Med, Chapel Hill, NC 27515 USA
[4] Inst Nacl Ciencias Neurol, Lima, Peru
[5] Johns Hopkins Univ, Welch Med Lib, Baltimore, MD USA
[6] Johns Hopkins Univ, Sect Palliat Care, Dept Med, Div Gen Internal Med, Baltimore, MD USA
[7] Johns Hopkins Univ, Sch Med, Dept Neurol, Baltimore, MD USA
[8] Johns Hopkins Univ, Sch Med, Dept Neurosurg, Baltimore, MD USA
[9] Johns Hopkins Univ, Sch Med, Dept Anesthesiol & Crit Care Med, Baltimore, MD USA