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APA Citation
Schwendicke, F., Plaumann, A., Stolpe, M., Dörfer, C. E., & Graetz, C. (n.d.). retention costs of periodontally compromised molars in a German population. Journal of clinical periodontology, 43, 261–270. http://access.bl.uk/ark:/81055/vdc_100031255426.0x00002f