1 Department of Ophthalmology, Fundación Oftalmológica de Santander FOSCAL; Centro Oftalmológico Virgilio Galvis; Faculty of Health Sciences, Department of Ophthalmology, Universidad Autónoma de Bucaramanga UNAB, Floridablanca, Colombia.
2 Department of Ophthalmology, Fundación Oftalmológica de Santander FOSCAL, Floridablanca; Faculty of Health Sciences, Department of Ophthalmology, Universidad Industrial de Santander UIS, Bucaramanga, Colombia.