Retraction notice to "The association between metformin therapy and risk of gynecological cancer in patients: two meta-analyses" [British Journal of Oral and Maxillofacial Surgery, Volume 57, Issue 8, October 2019, Pages 782-787]
1 Department of Oral and Maxillofacial Surgery, Heinrich Heine University Duesseldorf, Moorenstrasse 5, 40225 Duesseldorf, Germany.
2 Department of Psychology, University of Applied Sciences, Doberaner Weg 20, 22143 Hamburg, Germany.
3 Department of Oral and Maxillofacial Surgery, Leeds Teaching Hospitals and St James Institute of Oncology, Leeds Dental Institute and University of Leeds, United Kingdom.
4 Department of Ophthalmology, Hannover Medical School Carl-Neuberg-Strasse 1, 30625 Hannover, Germany.
5 Department of Oral and Maxillofacial Surgery, Hannover Medical School Carl-Neuberg-Strasse 1, 30625 Hannover, Germany.