# Searches
1 africa/ or africa, sub-sahara/ or africa, western/ or nigeria/
2 exp vital statistics/
3 (incidence* or prevalence* or morbidity or mortality).tw.
4 (disease adj3 burden).tw.
5 exp "cost of illness"/
6 case fatality rate.tw
7 hospital admissions.tw
8 Disability adjusted life years.mp.
9 (initial adj2 burden).tw.
10 exp risk factors/
11 2 or 3 or 4 or 5 or 6 or 7 or 8 or 9 or 10
12 exp dementia/ or exp alzheimer’s disease/ or exp cognitive impairment/ or exp parkinson’s disease/
13 1 and 11 and 12
14 Limit 13 to “1990-current”