[1] Univ Porto, Ctr Hosp Univ St Antonio, Dept Ophthalmol, Porto, Portugal
[2] Univ Porto, Inst Biomed Sci Abel Salazar, Dept Ophthalmol, Porto, Portugal
[3] Univ Porto, Dept Biomed, Unit Anat, Fac Med, Porto, Portugal
[4] Ctr Hosp Univ Porto, Dept Ophthalmol, P-4099001 Porto, Portugal