[1
]
Clinical Science Centre, Institute of Ageing and Chronic Disease, University of Liverpool,
Liverpool, UK. Electronic address: pmacal@liverpool.ac.uk.
[2
]
Department of Pulmonary Medicine and Critical Care, University of Texas Health Sciences
Center and South Texas Veterans' Health Care System, San Antonio, TX, USA.
[3
]
Boehringer Ingelheim Pharmaceuticals Inc, Ridgefield, CT, USA.
[4
]
Boehringer Ingelheim International GmbH, Ingelheim am Rhein, Germany.
[5
]
The George Institute of Global Health Sydney, Concord Clinical School, The University
of Sydney, UNSW, Sydney, NSW, Australia.
[6
]
Clinical Respiratory Science Division, National Heart and Lung Institute, Imperial
College London, London, UK.
[7
]
LungClinic Grosshansdorf, Grosshansdorf, Germany.