1. Department of Medical Biochemistry, Oslo University Hospital, University of Oslo, Oslo, Norway2The Norwegian Dry Eye Clinic, Oslo, Norway
2. The Norwegian Dry Eye Clinic, Oslo, Norway
3. Department of Information Engineering, University of Padova, Padova, Italy
4. Faculty of Health Sciences, Institute for Clinical and Experimental Medicine, Department of Ophthalmology, Linköping University, Linköping, Sweden
5. Department of Medical Biochemistry, Oslo University Hospital, University of Oslo, Oslo, Norway2The Norwegian Dry Eye Clinic, Oslo, Norway5Department of Oral Biology, Faculty of Dentistry, University of Oslo, Oslo, Norway