Huang C, Huang L, Wang Y, et. al.: 6-month consequences of COVID-19 in patients discharged from hospital: a cohort study. Lancet, January 8 (online), 2021
Carfi A, Bernabei R, Landi F, et al.: Persistent symptoms in patients after acute COVID-19. JAMA, 324, 603-605, 2020
Nehme M, Braillard O, Chappuis F, et. al.: Prevalence of symptoms more than seven months after diagnosis of symptomatic COVID-19 in an outpatient setting. Ann Int Med, 174, 1252-1260, 2021