1. Department of Respiratory Medicine, University Hospital Zurich, Zurich, Switzerland.
2. Swiss-Kyrgyz High Altitude Medicine and Research Initiative, Zurich, Switzerland.
3. Swiss-Kyrgyz High Altitude Medicine and Research Initiative, Bishkek, Kyrgyz Republic.
4. Department of Respiratory Medicine, National Center for Cardiology and Internal Medicine, Bishkek, Kyrgyz Republic.