Meseck, Kristin, Marta Jankowska, Jasper Schipperijn, Loki Natarajan, Suneeta Godbole, Jordan Carlson, Michelle Takemoto, Katie Crist, and Jacqueline Kerr. “Is Missing Geographic Positioning System Data in Accelerometry Studies a Problem, and Is Imputation the Solution?”. Geospatial Health 11, no. 2 (May 31, 2016). Accessed October 18, 2019. https://geospatialhealth.net/index.php/gh/article/view/403.