- Correspondence to Dr Melissa A Miller, Clinical Lecturer, Pulmonary and Critical Care Medicine, University of Michigan, 1500 E. Medical Center Drive, TC 3916, Ann Arbor, MI 48109-5360, USA;
- Accepted 26 August 2011
- Published in print 1 February 2012.
- Published online 19 January 2012.
- Published first 22 September 2011.
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