title: In reply 2.
authors.affiliation: Department of Respiratory Medicine, Auckland District Health Board, Auckland, Centre for International Health, University of Otago, Dunedin.
authors.forename: M J
authors.initials: MJ
authors.lastname: Maze
authors.affiliation: Department of Respiratory Medicine, Auckland District Health Board, Auckland.
authors.forename: J
authors.initials: J
authors.lastname: Paynter
authors.affiliation: Department of Chemical Pathology, LabPlus Laboratories, Auckland.
authors.forename: W
authors.initials: W
authors.lastname: Chiu
authors.affiliation: Research Office, Auckland District Health Board.
authors.forename: R
authors.initials: R
authors.lastname: Hu
authors.affiliation: Department of Respiratory Medicine, Auckland District Health Board, Auckland.
authors.forename: M
authors.initials: M
authors.lastname: Nisbet
authors.affiliation: Department of Respiratory Medicine, Auckland District Health Board, Auckland.
authors.forename: C
authors.initials: C
authors.lastname: Lewis