Pre-existing chronic illnesses as a risk factor for the onset of respiratory failure due to COVID-19 by Branko Beronja, Tatjana Gazibara, Jelena Dotlic, Ivan Nesic, Jelena Jankovic, Suncica Kapor, Nikola Blagojevic, Dragana Blagojevic, Isidora Guslarevic, Vladimir Djukic, Vladan Vukomanovic, Predrag Savic, Aleksandra Sljivic

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