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APA Citation
Baumeister, S., Ricci, C., Kohler, S., Fischer, B., Töpfer, C., Finger, J., & Leitzmann, M. (2016). physical activity surveillance in the European Union: reliability and validity of the European Health Interview Survey-Physical Activity Questionnaire (EHIS-PAQ). International journal of behavioral nutrition and physical activity, 13(1), 1–10. http://access.bl.uk/ark:/81055/vdc_100080458984.0x0000c6