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Chamorro H, Barquín I, Gómez P, Ayala F, Ramírez A, Silva AM, Quispe P.Chamorro H, et al. Among authors: ramirez a.Rev Med Chil. 1992 Jun;120(6):644-50.Rev Med Chil. 1992.PMID: 1341794Spanish.
Ramírez A, Araya MV, Aramburu I, Ayala F, Chamorro H, Silva AM.Ramírez A, et al.Rev Med Chil. 1991 Jun;119(6):670-6.Rev Med Chil. 1991.PMID: 1844371Spanish.
Massardo T, González P, Yovanovich J, Maiers E, Ayala F, Ramírez A, Berr JL, Zamorano J, Humeres P, Muñoz A, et al.Massardo T, et al. Among authors: ramirez a.Rev Med Chil. 1994 Dec;122(12):1353-61.Rev Med Chil. 1994.PMID: 7659908Clinical Trial.Spanish.
Massardo T, Maiers E, Zamorano J, Berr ML, Ayala F, Ramírez A, Arriagada M, González P, Alliende I.Massardo T, et al. Among authors: ramirez a.Rev Med Chil. 1994 Apr;122(4):435-40.Rev Med Chil. 1994.PMID: 7809539Spanish.
Ramirez A, Ugalde H, Ayala F, Yovanovic J, Chamorro H, Silva AM, Quispe P.Ramirez A, et al.Rev Med Chil. 1993 Oct;121(10):1161-73.Rev Med Chil. 1993.PMID: 8191121Spanish.
Ramírez A, Hernández I, Arcile G, Farrú O, Silva AM, Quispe P.Ramírez A, et al.Rev Med Chil. 1993 Mar;121(3):301-6.Rev Med Chil. 1993.PMID: 8248644Spanish.