About the Authors

G. G. Koning

g.koning@chir.umcn.nl

Affiliation Department of Surgery, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands

J. Wetterslev

Affiliation The Copenhagen Trial Unit (CTU), Centre of Clinical Intervention Research, University of Copenhagen, Rigshospitalet, Copenhagen, Denmark

C. J. H. M. van Laarhoven

Affiliation Department of Surgery, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands

F. Keus

Affiliations Department of Surgery, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands, The Copenhagen Trial Unit (CTU), Centre of Clinical Intervention Research, University of Copenhagen, Rigshospitalet, Copenhagen, Denmark

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: GGK FK JW CL. Performed the experiments: GGK FK JW CL. Analyzed the data: GGK JW CL FK. Contributed reagents/materials/analysis tools: GGK FK JW CL. Wrote the paper: GGK FK JW CL. Contributed to high standard of performing a protocol based systematic review with trial sequential analyses: GGK JW CL FK.