Correction: Stress Reduction in Perioperative Care: Feasibility Randomized Controlled Trial - Haridimos Kondylakis; Irene Alice Chicchi Giglioli; Dimitrios Katehakis; Hatice Aldemir; Paul Zikas; George Papagiannakis; Santiago Hors-Fraile; Pedro L González-Sanz; Konstantinos Apostolakis; Constantine Stephanidis; Francisco J Núñez-Benjumea; Rosa M Baños-Rivera; et al. (Journal of Medical Internet Research)