[1] Tribhuvan Univ, Dept Internal Med, Inst Med, Maharajgunj Med Campus, Kathmandu, Nepal
[2] Univ Louisville, Sch Med, Dept Neurol, Louisville, KY 40292 USA
[3] Natl Univ Singapore Hosp, Dept Internal Med, Singapore, Singapore
[4] Tribhuvan Univ, Dept Otorhinolaryngol, Teaching Hosp, Kathmandu, Nepal
[5] Tribhuvan Univ, Dept Neurol, Teaching Hosp, Kathmandu, Nepal
[6] Tribhuvan Univ, Dept Anesthesiol, Teaching Hosp, Kathmandu 44600, Nepal