Health (3) Salud (3) Estudio (3) Youth (2) Population (2) Población (2) Jóvenes (2) Colombie (1) Focus groups (1) Weights and measures (1) Tools (1) Time (1) Continuo (1) Speeches, addresses, etc (1) Scientists (1) Sanitation (1) Responsibility (1) Reason (1) Public health (1) Physics (1) Physicists (1) Perception (1) Old age homes (1) Old age (1) Nature (1) Methodology (1) Mental health (1) Materials (1) Human beings (1) Literature (1)