1. From the Department of Ophthalmology, Linköping University Hospital, Linköping, Sweden;
2. the Department of Ophthalmology, Sahlgren University Hospital, Mölndal, Sweden;
3. the Department of Obstetrics and Gynecology, Gothenburg University, Gothenburg, Sweden;
4. the Department of Physiology, Gothenburg University, Gothenburg, Sweden; and
5. the Department of Ophthalmology, University Hospital, Uppsala, Sweden.