Primary health care (1) Voluntarism (1) Trust (1) Sex (Biology) (1) Sampling (1) Population (1) Neisseria meningitidis (1) Interest (1) Shingles (Disease) (1) Health (1) Error (1) Design (1) Confidence (1) Toma de muestras (1) Herpes zóster (1) Confianza (1) Atención primaria (1) Neisseria meningitidis (1) Error (1) Salud (1) Interés (1) Voluntariado social (1) Estudio (1) Diseño (1) Población (1) Sexo (1) distribution (1) intérêt (1)