title: Serum levels of matrix metalloproteinase-9, tissue inhibitors of metalloproteinase-1 and their ratio are associated with impaired lung function in the elderly: a population-based study.
authors.affiliation: Department of Medical Sciences: Respiratory Medicine & Allergology, Uppsala University Hospital, SE 751 85 Uppsala, Sweden. inga_sif.olafsdottir@medsci.uu.se
authors.forename: Inga S
authors.initials: IS
authors.lastname: Olafsdóttir
authors.forename: Christer
authors.initials: C
authors.lastname: Janson
authors.forename: Lars
authors.initials: L
authors.lastname: Lind
authors.forename: Johannes
authors.initials: J
authors.lastname: Hulthe
authors.forename: María
authors.initials: M
authors.lastname: Gunnbjörnsdóttir
authors.forename: Johan
authors.initials: J
authors.lastname: Sundström