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Article History

First Online: 17 August 2020

Compliance with Ethical Standards

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: The first author is the founder, owner, and director of the KAVBA Center and the KAVBA Center is a private, for-profit agency in Seoul, South Korea. The second and corresponding author declares that she has no conflict of interest. The third author consults at the KAVBA Center.

: All procedures performed in studies involving human participants were in accordance with the ethical standards of the KAVBA Center and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

: Informed consent was obtained from all individual participants included in the study.