1. Frida Gyllenberg and Oskari Heikinheimo are with the Department of Obstetrics and Gynecology, University of Helsinki, Helsinki, Finland. Frida Gyllenberg is also with the City of Vantaa, Vantaa, Finland. Mikael Juselius is with the Bank of Finland, Helsinki. Mika Gissler is with the Information Services Department, National Institute for Health and Welfare, Helsinki, and with Karolinska Institute, Department of Neurobiology, Care Sciences and Society, Division of Family Medicine, Stockholm, Sweden.