Subjects: CELL phones; MEDICAL masks; COVID-19ALGERIA; MEDITERRANEAN Region
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Subjects: PREVENTION of epidemics; BEHAVIOR modification; INTERMENTSIERRA Leone
Subjects: DIAGNOSIS of HIV infections; HIV infections; THERAPEUTICS
Subjects: CENSUS; COMMUNITY health services; CONFIDENCE intervalsNIGERIA
Subjects: POLIO prevention; CONFIDENCE intervals; EPIDEMIOLOGYPAKISTAN
Subjects: *CONFIDENCE intervals; *ETHNIC groups; *HEALTH services accessibilityBOLIVIA; BRAZIL; DOMINICAN Republic