[1] Johns Hopkins Univ, Neurol, Sch Med, Baltimore, MD USA
[2] Univ Teaching Hosp, Internal Med Neurol, Lusaka, Zambia
[3] Minist Hlth, Internal Med Neurol, Lusaka, Zambia
[4] Univ Teaching Hosp, Internal Med Pulmonol, Lusaka, Zambia
[5] Brown Univ, Neurol, Providence, RI USA
[6] Univ Zambia, Neurol, Lusaka, Zambia