1. Department of Medical Biochemistry, Oslo University Hospital, Oslo, Norway
2. The Norwegian Dry Eye Clinic, Oslo, Norway
3. Department of Ophthalmology, Arendal Hospital, Arendal, Norway
4. Department of Oral Surgery and Oral Medicine, Faculty of Dentistry, University of Oslo, Oslo, Norway
5. Faculty of Health Sciences, National Centre for Optics, Vision and Eye Care, University College of Southeast Norway, Kongsberg, Norway
6. Department of Ophthalmology, Vestre Viken Hospital Trust, Drammen, Norway
7. Department of Ophthalmology, Shanghai Jiaotong University affiliated Sixth People’s Hospital, Shanghai, China
8. Department of Ophthalmology, Oslo University Hospital, Oslo, Norway
9. Department of ophthalmology, University Hospital North Norway, Tromsø, Norway
10. Schepens Eye Research Institute/Massachusetts Eye and Ear, Harvard Medical School, Boston, MA, USA