classification (1) Language (1) Employment (1) Reproduction (1) Assaying (1) Texts (1) Texts (1) Notions (Philosophy) (1) Worms (1) Vision (1) Reproduction (1) Quality of life (1) Physicians (1) Hypothesis (1) Expression (1) Concepts (1) Classification (1) Classification (1) Classification (1) Validity (1) Analysis (1) Patients (1) Quality (1) Occupations (1) Health (1) Salud (1) Conceptos (1) Vista (1) Médicos (1) Trabajo (1)