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Bulletin of the Pan American Health Organization|January 1, 1977
Extension of health service coverage in Costa RicaH Villegas
Archives of Andrology|September 1, 1991
Electron microscopy of Chlamydia trachomatis infection of the male genital tractH Villegas, M Piñon, V Shor, et al.
Revista De Biologia Tropical|December 1, 1978
[Human fetal growth in Costa Rica, 1970-1975]L Mata, H Villegas, C Albertazzi, et al.
Ginecologia Y Obstetricia De Mexico|April 1, 1996
[Ultrastructural and immunocytochemical analysis of the synaptonemal complex at the initiation of synapsis]E Flores-Rivera, H Villegas-Castrejon, G H Vazquez-Nin
Archives of Andrology|September 1, 1997
Ultrastructural characteristics of Gardnerella vaginalis infection in the heterosexual coupleH Villegas, F Arias, E Flores, et al.
Ginecologia Y Obstetricia De Mexico|June 11, 1999
[Response of fetal macrophages in the placenta of pregnant HIV-positive patients with and without antiretroviral treatment]H Villegas Castrejón, J Mayón González, Y Paredes Vivas, et al.
Diseases of Aquatic Organisms|August 30, 2018
Octopus maya parasites off the Yucatán Peninsula, Mexico. II. Salivary gland damage by cestodesS Guillén-Hernández, C González-Salas, D Pech-Puch, et al.
Ginecologia Y Obstetricia De Mexico|May 1, 1994
[Ultrastructural study of placentas from HIV seropositive women]H Villegas Castrejon, J Carrillo Farga, Y Paredes, et al.
Ginecologia Y Obstetricia De Mexico|April 1, 1994
[Estrogen therapy in postoperative gynecologic cancer patients]G Muñoz Doménico, G Alvarez Ahumada, H Villegas Castrejón, et al.
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