From Lab-Based Studies to Eye-Tracking in Virtual and Real Worlds: Conceptual and Methodological Problems and solutions.: Symposium 4 at the 20th European Conference on Eye Movement Research (ECEM) in Alicante, 20.8.2019. J Eye Mov Res 2019, 12 (7). https://doi.org/10.16910/jemr.12.7.8.