1. Unit of Vitreoretinal Surgery; Department of Ophthalmology; University of Helsinki and Helsinki University Hospital; Helsinki Finland
2. School of Pharmacy; Faculty of Health Sciences; University of Eastern Finland; Kuopio Finland
3. Department of Ophthalmology; Institute of Clinical Medicine; University of Eastern Finland; Kuopio Finland
4. Department of Ophthalmology; Kuopio University Hospital; Kuopio Finland