Aloumanis, K. Kapetanos, G. Alexandridis, T. Drossinos, V. Papaioannou, N. for the Greek ExFOS study group, Correction to: Conducting an observational study during an economic crisis: analysis of the treatment and follow-up phase of Greek patients participating in the ExFOS study (Hormones, (2018), 17, 4, (531-540), 10.1007/s42000-018-0077-6), Vitamins and Hormones, (18), 113, 2019, Springer-Verlag,