1 Subjects: “...LMIC = low- and middle-income countries...”

2 Subjects: “...low-income population...”

3 Subjects: “...low-income adults...”

4 Subjects: “...income heterogeneity...”

5 Subjects: “...low and middle income countries...”

6 Subjects: “...low and middle income...”

7 Subjects: “...middle-and low-income countries...”

8 Subjects: “...low-income...”

9 Subjects: “...low and middle income and countries...”

10 Subjects: “...lower middle income countries...”

11 Subjects: “...income-related inequality of health...”

12 Subjects: “...low-income...”

13 Subjects: “...income effect...”

14 Subjects: “...low-income country...”