Erratum to: 24-h Efficacy of Glaucoma Treatment Options. Issue 4 (April 2016) - Konstas, Anastasios; Quaranta, Luciano; Bozkurt, Banu; Katsanos, Andreas; Garcia-Feijoo, Julian; Rossetti, Luca; Shaarawy, Tarek; Pfeiffer, Norbert; Miglior, Stefano