[1
]Department of Obstetrics and Gynecology; Helsinki University Central Hospital; Helsinki
Finland
[2
]Department of Obstetrics and Gynecology; University of Helsinki; Helsinki Finland
[3
]Department of Obstetrics and Gynecology; South-Karelia Central Hospital; Lappeenranta
Finland
[4
]Department of General Practice and Primary Health Care; University of Helsinki and
Helsinki University Hospital; Helsinki Finland
[5
]Folkhälsan Research Center; Helsinki; University of Helsinki; Helsinki Finland
[6
]Department of Health and Social Management; University of Eastern Finland; Kuopio
Finland
[7
]Group Administration; University of Helsinki and Helsinki University Hospital; Helsinki
Finland