Colombie (4) Estudio (4) Materials (3) Health (3) Children (3) Salud (3) Niños (3) Materiales (3) Sampling (2) Motor ability (2) Associations, institutions, etc (2) Academic achievement (2) Ability (2) Toma de muestras (2) Motricidad (2) Rendimiento académico (2) Asociaciones (2) Aptitudes (2) Labor (1) Labor market (1) Constructivism (Education) (1) Women (1) Teaching (1) Students (1) Sex (Biology) (1) Research (1) Psychology (1) Population (1) Physics (1) Perspective (1)