Items where Author is "Köppen, J."
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Sermeus, W., Aiken, L. H., Ball, J. (2022). A workplace organisational intervention to improve hospital nurses' and physicians' mental health: study protocol for the Magnet4Europe wait list cluster randomised controlled trial. BMJ Open, 12(7), article number e059159. doi: 10.1136/bmjopen-2021-059159
