Contribution to Authorship:
Physiotherapist Thorgerdur Sigurdardottir PhD contributed to the design,
execution, analysis and interpretation of the study.
Obstetricians/gynecologists Thora Steingrimsdottir MD, PhD and Reynir T.
Geirsson MD, PhD, FRCOG and Prof. Kari Bø PhD contributed to the design,
execution, analysis and interpretation of the study, while statisticians
Thorhallur Halldorsson PhD and Thor Aspelund PhD contributed to the
design and analysis of the material. All authors have contributed to the
writing of the manuscript.