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Authors
Dragomirova, Mila
Antonova, Albena
Stoykova, Slavena
Mihova, Gergana
Grigorova, Denitsa
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Article History
Received: 6 January 2022
Accepted: 24 May 2022
First Online: 4 June 2022
Declarations
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: The design of the study is observational, and no intervention procedures (i.e. atropine) are made<b>.</b> Written informed consent is obtained from at least one of the parents. Verbal consent is obtained from each child before the examination. The study is in line with the principles of the Declaration of Helsinki and follows a protocol approved by Sofia University, the Department of Optics and the Spectroscopy Research Council.
: Not applicable.
: The authors declare that they have no competing interests.
