University Hospital, Zurich, Switzerland
Respiratory Clinic, University Hospital of Zurich, Zurich, Switzerland
Universitiy Hospital, Zurich, Switzerland
Clinical Trials Center, Zurich, Switzerland
University Hospital Zurich, Clinic and Policlinic of Internal Medicine, Zurich, ZH, Switzerland
Praxis Dr. med. Markus Gnaedinger, Steinach, SG, Switzerland
University Hospital Zurich, Gastroenterology, Zurich, Switzerland
University Hospital Berne (Insel) and Zieglerspital Berne, Berne, Switzerland
Geneva University Hospitals and Medical Faculty of the University of Geneva, Geneva, Switzerland
Allergy Unit, Department of Dermatology, University Hospital Zurich, Zurich, Switzerland
Churchill Hospital, Oxford Centre for Respiratory Medicine, Oxford, United Kingdom
Cantonal Hospital Munsterlingen, Departement of Internal Medicine, Pulmonary Division, Munsterlingen, Switzerland
University Hospital Zurich, Pulmonary Division, Zurich, Switzerland
University of Zurich, Zurich, Switzerland