[1] Wake Forest Sch Med, Dept Neurol, Winston Salem, NC USA
[2] Univ Washington, Dept Family Med, Seattle, WA 98195 USA
[3] Wake Forest Sch Med, Dept Med Studies, Winston Salem, NC USA
[4] Univ Virginia, Dept Family Med, Charlottesville, VA USA
[5] Providence St Peter Hosp, Dept Family Med, Olympia, WA USA