Table 1.

Ovid Medline search strategy (1946 to December 31, 2016).

Search no.	Query
1	exp Epidemiology/ OR exp Epidemiologic Methods/ OR exp Epidemiologic Studies/
2	Incidence/
3	Prevalence/
4	Awareness/
5	risk factors/
6	Protective Factors/
7	“Social Determinants of Health”/
8	exp Risk/
9	exp Morbidity/
10	exp Mortality/
11	Comorbidity/
12	1 OR 2 OR 3 OR 4 OR 5 OR 6 OR 7 OR 8 OR 9 OR 10 OR 11
13	(epidemiolog* OR incidence OR prevalence OR awareness OR “risk factor*” OR burden OR risk* OR determinant* OR morbidit* OR mortality OR comorbidit*).mp. [mp=title, abstract, original title, name of substance word, subject heading word, keyword heading word, protocol supplementary concept word, rare disease supplementary concept word, unique identifier]
14	12 OR 13
15	exp Hypertension/
16	(Hypertens* OR “raised blood pressure” OR “high blood pressure” OR “systolic blood pressure” OR “diastolic blood pressure”).mp. [mp=title, abstract, original title, name of substance word, subject heading word, keyword heading word, protocol supplementary concept word, rare disease supplementary concept word, unique identifier]
17	15 or 16
18	Cameroon/ NOT Nigeria.mp. [mp=title, abstract, original title, name of substance word, subject heading word, keyword heading word, protocol supplementary concept word, rare disease supplementary concept word, unique identifier]
19	Cameroun.mp. [mp=title, abstract, original title, name of substance word, subject heading word, keyword heading word, protocol supplementary concept word, rare disease supplementary concept word, unique identifier]
20	(“Western ADJ highland*”OR Grassfield* OR Bamileke OR Bamoum OR Bamoun OR “Coastal ADJ tropical ADJ forest” OR Bassa OR Douala OR “Southern ADJ tropical ADJ forest” OR Ewondo OR Beti OR Bulu OR Fang OR Maka OR Pygm* OR Baka OR Fulani OR Fulbe OR Peul OR Peuhl OR “Islamic ADJ Northerners” OR “Non-Islamic ADJ Northerners” OR “Centre ADJ region” OR “East ADJ region” OR “South ADJ region” OR “Littoral ADJ region” OR “South ADJ West ADJ region” OR “West ADJ region” OR “North ADJ West ADJ region” OR “Adamawa ADJ region” OR “North ADJ region” OR “Far-North ADJ region” OR “Centre ADJ province” OR “East ADJ province” OR “South ADJ province” OR “Littoral ADJ province” OR “South ADJ west ADJ province” OR “West ADJ province” OR “North ADJ West ADJ province” OR “Adamawa ADJ province” OR “North ADJ province” OR “Far-North ADJ province”).mp. [mp=title, abstract, original title, name of substance word, subject heading word, keyword heading word, protocol supplementary concept word, rare disease supplementary concept word, unique identifier]
21	18 OR 19 OR 20
22 (Q1a)	12 AND 17 AND 21
23	Mass Screening/
24	exp Diagnosis/
25	exp Therapeutics/
26	exp Tertiary Prevention/ OR exp Secondary Prevention/ OR exp Primary Prevention/
27	exp Disease Management/
28	Early Medical Intervention/
29	exp Policy/
30	23 OR 24 OR 25 OR 26 OR 27 OR 28 OR 29
31	(Control OR screening OR diagnosis OR measurement OR treatment OR prevention OR management OR intervention OR program OR policy OR action OR Trial).mp. [mp=title, abstract, original title, name of substance word, subject heading word, keyword heading word, protocol supplementary concept word, rare disease supplementary concept word, unique identifier]
32 (Q2b)	22 AND 31

^aQ1: review question 1.

^bQ2: review question 2.