Lancet. Respir. Med.
14 Charlson M.E., Pompei P., Ales K.L., et al. (1987) A new method of classifying prognostic comorbidity in longitudinal studies: Development and validation. J. Chronic Dis. 40 , 373–383.
15 Quan H., Li B., Couris C.M., et al. (2011) Updating and validating the charlson comorbidity index and score for risk adjustment in hospital discharge abstracts using data from 6 countries. Am. J. Epidemiol. 173 , 676–682.
16 Staibano P., Levin M., McHugh T., et al. (2021) Association of Tracheostomy With Outcomes in Patients With COVID-19 and SARS-CoV-2 Transmission Among Health Care Professionals: A Systematic Review and Meta-analysis. JAMA Otolaryngol. Neck Surg. 147 , 646–655.
17 Li M., Yiu Y., Merrill T., et al. (2018) Risk Factors for Posttracheostomy Tracheal Stenosis. Otolaryngol. - Head Neck Surg. (United States) 159 , 698–704.
18 Cummings M.J., Baldwin M.R., Abrams D., et al. (2020) Epidemiology, clinical course, and outcomes of critically ill adults with COVID-19 in New York City: a prospective cohort study.Lancet 395 , 1763–1770.
19 Nouraei S.A.R., Hudovsky A., Frampton A.E., et al. (2015) A study of clinical coding accuracy in surgery: Implications for the use of administrative big data for outcomes management. Ann. Surg.261 , 1096–1107.