@article{BrandNosratSpaethetal.2022,
  author    = {Ralf Brand and Sanaz Nosrat and Constantin Sp{\"a}th and Sinika Timme},
  title     = {Using COVID-19 Pandemic as a Prism: A Systematic Review of Methodological Approaches and the Quality of Empirical Studies on Physical Activity Behavior Change},
  journal   = {Frontiers in Sports and Active Living},
  volume    = {4},
  pages     = {1 -- 17},
  doi       = {10.3389/fspor.2022.864468},
  year      = {2022},
}