Department of Oral and Maxillofacial Surgery, University Medical Center Groningen, PO Box 30.001, NL-9700 RB, Groningen, The Netherlands

Henny J. A. Meijer & Gerry M. Raghoebar

Department of Implant Dentistry, University Medical Center Groningen, Groningen, The Netherlands

Henny J. A. Meijer

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HJAM has the following contributions: (1) data collection, concept/design, statistics, and data analysis/interpretation, (2) drafting of the article, (3) final approval, and (4) accountable for all aspects of the work. GMR has the following contributions: (1) concept/design and data analysis/interpretation, (2) surgery, (3) critical revision of article, (4) final approval, and (5) accountable for all aspects of the work.

Correspondence to Henny J. A. Meijer.