1. Schepens Eye Research Institute of Massachusetts Eye and Ear, Department of Ophthalmology, Harvard Medical School, Boston, Massachusetts, United States
2. Faculty of Medicine, University of Oslo, Oslo, Norway
3. National Taiwan University, Taiwan
4. Department of Oral Biology, Faculty of Dentistry, University of Oslo, Norway
5. Geriatric Research Education and Clinical Center, Office of Research and Development, Edith Nourse Rogers Memorial Veterans Hospital, Bedford, Massachusetts, United States