1. Department of Ophthalmology, PEDEGO Research Unit and Medical Research Center, University of Oulu, Oulu, Finland
2. Department of Ophthalmology, Oulu University Hospital, Oulu, Finland
3. Research Service Unit, Oulun yliopistollinen sairaala, Oulu, Finland
4. The Research Unit of Surgery, Anesthesia and Intensive Care, Oulu University Hospital and University of Oulu, Oulu, Finland