Mitxelena, A. (2019) “Sputum Gram stain test is sensitive and highly specific for identifying the main causative pathogens in adult patients with CAP”, Osagaiz: osasun-zientzien aldizkaria, 3(2). Available at: https://aldizkariak.ueu.eus/index.php/osagaiz/article/view/282 (Accessed: 11 November 2026).