- Correspondence to Professor Peter G Gibson, Department of Respiratory and Sleep Medicine, John Hunter Hospital, Level 2, Hunter Medical Research Institute, Kookaburra Circuit, New Lambton Heights, NSW 2305, Australia;
- Received 5 January 2015
- Revised 9 April 2015
- Accepted 17 April 2015
- Published in print 1 July 2015.
- Published online 12 June 2015.
- Published first 6 May 2015.
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