1. Universidad Autónoma de Bucaramanga (UNAB), School of Medicine, Department of Ophthalmology, Bucaramanga, Colombia
2. Centro Oftalmológico Virgilio Galvis, Floridablanca, Colombia
3. Fundación Oftalmológica de Santander FOSCAL, Department of Ophthalmology, Floridablanca, Colombia
4. Universidad Industrial de Santander (UIS), School of Medicine, Department of Surgery, Bucaramanga, Colombia