échantillonnage (3) Swiss (3) Sampling (3) Transmission (3) Sampling (3) Population (3) cohorte (3) virus (2) arbre (2) santé publique (2) modèle (2) infection (2) abords (agglomération) (2) Case (2) Methods (2) Heterosexuals (2) Immunodeficiency (2) Public health (2) Patients (2) Manufacturers' agents (2) Human beings (2) Infection (2) Grammar, Comparative and general--Case (2) Example (2) Comprehension (2) Commission merchants (2) Case (2) Methods (2) Use (2) Influence (2)