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Authors
Vakrilova, Liliya https://orcid.org/0000-0002-6586-8623
Nikolova, Stanislava Hitrova
Slavov, Sergei
Radulova, Petya
Slancheva, Boryana
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Article History
Received: 25 July 2021
Accepted: 3 December 2021
First Online: 11 December 2021
Declarations
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: This study was conducted by the regulatory standards of Good Clinical Practice and the Declaration of Helsinki.Written consent to participate was obtained from the parents/legal guardians of the infants included in this study.The study has been approved by the Local Ethics Committee of the University Obstetrics and Gynecology Hospital “Maichin Dom”, Sofia.
: Not applicable.
: The authors declare that they have no competing interests.
