Effect of Systemic Illness and Comorbidities in the Prognosis of Severe Acute Respiratory Illness Patients: An Observational Study - Khurana, Deepa; Choudhury, Arin; Manisha, Manisha; Mitra Mustafi, Saurav; Uppal, Vibha; Khurana, Himanshu; Sachdeva, Harish; Gupta, Nitesh; Ganpathy, Usha (Archives of Anesthesiology and Critical Care, 2023)