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Van Winkelhoff AJ, Van der Velden U, Winkel EG, de Graaff J.Van Winkelhoff AJ, et al. Among authors: van der velden u.J Periodontal Res. 1986 Jul;21(4):434-9. doi: 10.1111/j.1600-0765.1986.tb01477.x.J Periodontal Res. 1986.PMID: 2942671No abstract available.