DOI:
10.1055/s-00025476
Endoscopy International Open
LinksClose Window
References
Charlson M, Pompei P, Ales K. et al.
A new method of classifying prognostic comorbidity in longitudinal studies: development and validation.
J Chronic Dis 1987;
40: 373-383
We do not assume any responsibility for the contents of the web pages of other providers.