Changing lung function and associated health-related quality-of-life: A five-year cohort study of Malawian adults.

Njoroge MW, Mjojo P, Chirwa C, Rylance S, Nightingale R, Gordon SB, Mortimer K, Burney P, Balmes J, Rylance J, Obasi A, Niessen LW, Devereux G, IMPALA consortium,