High fractional exhaled nitric oxide and sputum eosinophils are associated with an increased risk of future virus-induced exacerbations: A prospective cohort study

A Bjerregaard, I A Laing, V Backer, A Sverrild, S-K Khoo, G Chidlow, C Sikazwe, D W Smith, P Le Souëf, C Porsbjerg