@article{HeisselPietrekSchwefeletal.2020,
  author    = {Andreas Heissel and Anou F. Pietrek and Melanie Schwefel and Kahar Abula and Gregor Wilbertz and Stephan Heinzel and Michael A. Rapp},
  title     = {STEP.De study},
  journal   = {BMJ open},
  series    = {a multicentre cluster-randomised effectiveness trial of exercise therapy for patients with depressive symptoms in healthcare services : study protocol},
  volume    = {10},
  number    = {4},
  doi       = {10.1136/bmjopen-2019-036287},
  year      = {2020},
}