Chronic obstructive pulmonary disease in sub-Saharan Africa: a systematic review [Review article]
2013 ◽
Vol 17
(5)
◽
pp. 583-589
◽
2018 ◽
Vol 12
(3)
◽
pp. 227-237
◽
2009 ◽
Vol 7
(31)
◽
pp. 1353-1372