- Correspondence to Dr Yvonne Nussbaumer-Ochsner, Pulmonary Division, Cantonal Hospital of Muensterlingen, Spitalcampus 1, Muensterlingen 8596, Switzerland;
- Received February 10, 2015
- Revised February 23, 2015
- Accepted February 26, 2015
- First published March 31, 2015.
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