Case-Control Study of Risk Factors for Meningococcal Disease in Chile.
Olea A , Matute I, Gonzalez C, Delgado I, Poffald L, Pedroni E, Alfaro T, Hirmas M, Najera M, Gormaz A, Lopez D, Loayza S, Ferreccio C , Gallegos D, Fuentes R, Vial P, Aguilera X.