1 Department of Ophthalmology, Centro Hospitalar de Leiria, Leiria; Coimbra Institute for Clinical and Biomedical Research (iCBR), Coimbra, Portugal. Electronic address: Antonio.Figueiredo@chleiria.min-saude.pt.
2 Coimbra Institute for Clinical and Biomedical Research (iCBR), Coimbra, Portugal; Laboratory of Biostatistics and Medical Informatics, Faculty of Medicine, University of Coimbra, Coimbra, Portugal.
3 Coimbra Institute for Clinical and Biomedical Research (iCBR), Coimbra, Portugal; Department of Clinical Pathology, Centro Hospitalar e Universitário de Coimbra (CHUC), Coimbra, Portugal.