Anja Bisgaard Pinborg
The Fertility Clinic, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark

Anna-Karina Aaris Henningsen
The Fertility Clinic, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark

Mika Gissler
THL National Institute for Health and Welfare, Helsinki, Finland

Aila Tiitinen
Department of Obstetrics and Gynaecology, University of Helsinki and Helsinki University Hospital, Helsinki, Finland

Signe Opdahl
Department of Public Health and Nursing, Norwegian University of Science and Technology, Trondheim, Norway

Liv Bente Romundstad
Spiren Fertility Clinic, Trondheim, Norway
Centre for Fertility and Health, Norwegian Institute of Public Health, Oslo, Norway

Christina Bergh
Department of Obstetrics and Gynaecology, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Sahlgrenska University Hospital, Gothenburg, Sweden

Ulla-Britt Wennerholm
Department of Obstetrics and Gynaecology, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Sahlgrenska University Hospital, Gothenburg, Sweden