@article{WillekeJansonZinketal.2021,
  author    = {Kristina Willeke and Patrick Janson and Katharina Zink and Carolin Stupp and Sarah Kittel-Schneider and Anne Bergh{\"o}fer and Thomas Ewert and Ryan King and Peter U. Heuschmann and Andreas Zapf and Manfred Wildner and Thomas Keil},
  title     = {Occurrence of mental illness and mental health risks among the self-employed: a systematic review},
  journal   = {International Journal of Environmental Research and Public Health},
  volume    = {18},
  number    = {16},
  doi       = {10.3390/ijerph18168617},
  year      = {2021},
}