1. Department of Ophthalmology, Central Lisbon Hospital Center, Lisbon, Portugal 2NOVA Medical School, Universidade NOVA de Lisboa, Lisbon, Portugal
2. Epidemiology and Statistics Unit, Research Centre, Central Lisbon Hospital Center, Lisbon, Portugal
3. Department of Ophthalmology, Central Lisbon Hospital Center, Lisbon, Portugal
4. Department of Ophthalmology, Associação Médica Olhar bem, Lisbon, Portugal 5CEris-ICIST, Instituto Superior Técnico, Lisbon University, Lisbon, Portugal
5. NOVA Medical School, Universidade NOVA de Lisboa, Lisbon, Portugal 3Epidemiology and Statistics Unit, Research Centre, Central Lisbon Hospital Center, Lisbon, Portugal 6CEAUL (Center of Statistics and Applications), Lisbon University, Lisbon, Portugal
6. Department of Ophthalmology, Northern Lisbon Hospital Center, Lisbon, Portugal 8Visual Sciences Study Center, Faculty of Medicine, Lisbon University, Lisbon, Portugal