Acknowledgements
We thank the participants for their valuable contribution to this study. We also thank midwife Tone Breines Simonsen at Akershus University Hospital for recruiting participants and administering clinical appointments and electronic questionnaires; physiotherapist Kristin Gjestland at Akershus University Hospital for clinical testing and data entry; physiotherapists Ingeborg Hoff Brækken, Vigdis Skøld, and Ingvild Sandholt at Akershus University Hospital for supervising the interventional group training sessions; and Professor Ingar Holme at Norwegian School of Sport Sciences for statistical advice.