Shipitsyna, Elena http://orcid.org/0000-0002-2309-3604
Krysanova, Anna http://orcid.org/0000-0003-4798-1881
Khayrullina, Guzel http://orcid.org/0000-0003-1544-0730
Shalepo, Kira http://orcid.org/0000-0002-3002-3874
Savicheva, Alevtina http://orcid.org/0000-0003-3870-5930
Guschin, Alexander http://orcid.org/0000-0002-0399-1167
Unemo, Magnus http://orcid.org/0000-0003-1710-2081
Funding for this research was provided by:
D.O. Ott Research Institute of Obstetrics, Gynaecology and Reproductology (2016)
Central Research Institute of Epidemiology (2016)
Article History
First Online: 5 February 2019
Compliance with Ethical Standards
:
: The study was supported by the D.O. Ott Research Institute of Obstetrics, Gynaecology and Reproductology, St Petersburg, Russia and the Central Research Institute of Epidemiology, Moscow, Russia. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.
: Elena Shipitsyna, Anna Krysanova, Guzel Khayrullina, Kira Shalepo, Alevtina Savicheva, Alexander Guschin, and Magnus Unemo declare that they have no conflicts of interest that are directly relevant to the content of this study.
: The study was approved by the Ethical Committee at the D.O. Ott Research Institute of Obstetrics, Gynaecology and Reproductology, St Petersburg (approval number 73/2015).
: Informed consent was obtained from all individual participants included in the study.