Sheree M Smith1, Aimee Brame2, Elena Kulinskaya3, Sarah L Elkin2. 1. Imperial Clinical Respiratory Research Unit, Respiratory Infection and Medicine, St Mary's Hospital, Imperial College Healthcare NHS Trust, University of Sheffield, London, England; School of Nursing and Midwifery, University of Sheffield, London, England; Lung Institute of Western Australia, University of Western Australia, Nedlands, WA, Australia. Electronic address: smithsm01@yahoo.com.au. 2. Department of Chest and Allergy, St Mary's Hospital, Imperial College Healthcare NHS Trust, University of Sheffield, London, England. 3. Lung Institute of Western Australia, University of Western Australia, Nedlands, WA, Australia; School of Computing Sciences, University of East Anglia, Norwich, England.