Research (3) Estudio (3) Investigación (3) Cuba (2) Primary health care (2) Labor (2) Health (2) Ability (2) Atención primaria (2) Salud (2) Trabajo (2) Aptitudes (2) Programs (1) Employees (1) Vocational education (1) Vision (1) Trials (1) Time (1) Teachers (1) Students (1) Strategy (1) Quality of products (1) Public health (1) Possibility (1) Population (1) Perspective (1) Occupations (1) Measurement (1) National health services (1) Marketing (1)