%0 Letter
%T GOLD 2021 guidelines for COPD - what's new and why.
%A Gupta N
%A Malhotra N
%A Ish P
%J Adv Respir Med
%V 89
%N 3
%D 2021
%M 33881161
暂无%R 10.5603/ARM.a2021.0015
%X