Corrigendum: Longitudinal “Real-World” Outcomes of Pirfenidone in Idiopathic Pulmonary Fibrosis in Greece - Tzouvelekis, Argyrios; Karampitsakos, Theodoros; Ntolios, Paschalis; Tzilas, Vasilios; Bouros, Evangelos; Markozannes, Evangelos; Malliou, Ioanna; Anagnostopoulos, Aris; Granitsas, Andreas; Steiropoulos, Paschalis; Dimakou, Katerina; Chrysikos, Serafeim; et al. (Frontiers in Medicine, 2018)