| Affiliation: | 1. Department of Periodontology, Center for Dentistry and Oral Hygiene, University of Groningen, University Medical Center Groningen, , Groningen, The Netherlands;2. School of Health Care Studies, Hanze University of Applied Sciences Groningen, , Groningen, The Netherlands;3. Department of Obstetrics and Gynecology, University of Groningen, University Medical Center Groningen, , Groningen, The Netherlands;4. Division of Medical Biology, Department of Pathology and Medical Biology, University of Groningen, University Medical Center Groningen, , Groningen, The Netherlands |
