medical history \cite{Vogelmeier2017}.  

"The U.S. National Library of Medicine has made two datasets of postero-anterior (PA) chest radiographs available to foster research in computer-aided diagnosis of pulmonary diseases with a special focus on pulmonary tuberculosis (TB) "  \cite{Jaeger2014}. 

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Lower respiratory tract infection 4th top cause of death  \cite{death}. 

the chest radiograph is universally considered to be the “gold standard” (1, 8–10].