1. The Regenerative Medicine Unit, Department of Medical Biochemistry, Oslo University Hospital, Ullevål, 0450 Oslo, Norway
2. Blood Cell Research Group, Department of Medical Biochemistry, Oslo University Hospital, Ullevål, 0450 Oslo, Norway
3. Department of Ophthalmology, Sørlandet Hospital Arendal, 4838 Arendal, Norway
4. The Norwegian Dry Eye Clinic, 0369 Oslo, Norway
5. Department of Ophthalmology, Oslo University Hospital, 0450 Oslo, Norway
6. Department of Ophthalmology, Vestfold Hospital Trust, 3103 Tønsberg, Norway