Intravitreal ranibizumab alone or in combination with panretinal photocoagulation for the treatment of proliferative diabetic retinopathy with coexistent macular edema: long-term outcomes of a prospective study - Chatziralli, Irini; Dimitriou, Eleni; Theodossiadis, George; Kazantzis, Dimitrios; Theodossiadis, Panagiotis (Acta Diabetologica, 2020)