1. Department of Plastic and Reconstructive Surgery, Oslo University Hospital, Oslo, Norway
2. Department of Oral Biology, Faculty of Dentistry, University of Oslo, Oslo, Norway
3. Department of Medical Biochemistry, Oslo University Hospital, Oslo, Norway
4. Norwegian Dry Eye Clinic, Oslo, Norway
5. Department of Pathology, Oslo University Hospital, Oslo, Norway
6. Institut Universitari Barraquer, Universitat Autonoma de Barcelona, Barcelona, Spain
7. Institute of Clinical Medicine, Faculty of Medicine, University of Oslo, Oslo, Norway
8. Department of Ophthalmology, Stavanger University Hospital, Oslo, Norway
9. Department of Ophthalmology, Sørlandet Hospital, Arendal, Norway