Original ResearchArticles in Press111782Open access aDepartment of Obstetrics and Gynecology, Institute of Clinical Sciences, Sahlgrenska Academy at Gothenburg University, Gothenburg, Sweden bDepartment of Obstetrics and Gynecology, Sahlgrenska University Hospital, Gothenburg, Sweden cStatistical Consultancy Group, Gothenburg, Sweden, dDepartment of Obstetrics and Gynecology, Södra Älvsborgs Hospital, Borås, Sweden eJulius Center, University Medical Center Utrecht, Utrecht, the Netherlands...