What ethical conflicts do internists in Spain, México and Argentina encounter? An international cross-sectional observational study based on a self-administrated survey - Portillo, Antonio Blanco; Garcia-Caballero, Rebeca; de Asua, Diego Real; Dague, Karmele Olaciregui; Mendoza, Octavio Marquez; Valdez, Pascual; Herreros, Benjamin (BMC Medical Ethics, 2024)