Authors’ contribution
Study conception and design, data collection, analysis and interpretation were performed by Radoslav Chekerov, Rolf Richter and Jalid Sehouli. All authors except Rolf Richter recruited patients to the trial, were responsible for the conduct of the trial and obtained the study data. Statistical analysis was performed by Rolf Richter. The first draft of the manuscript was written by Radoslav Chekerov, Tjadina Arndt and Jalid Sehouli and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.