[1] Univ Munich, Hosp Grosshadern, Dept Neurol, D-81366 Munich, Germany
[2] Univ Munich, Hosp Grosshadern, Interdisciplinary Palliat Care Unit, D-81366 Munich, Germany
[3] Calif Pacific Med Ctr, Dept Neurol, San Francisco, CA USA
[4] Calif Pacific Med Ctr, Forbes Norris MDA ALS Ctr, San Francisco, CA USA