Törnros, Tobias, Helen Dorn, Markus Reichert, Ulrich Ebner-Priemer, Hans-Joachim Salize, Heike Tost, Andreas Meyer-Lindenberg, and Alexander Zipf. 2016. “A Comparison of Temporal and Location-Based Sampling Strategies for Global Positioning System-Triggered Electronic Diaries”. Geospatial Health 11 (3). https://doi.org/10.4081/gh.2016.473.