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Article History

Received: 6 February 2018

Accepted: 20 November 2018

First Online: 29 November 2018

Ethics approval and consent to participate

: The protocols of the present study were approved by the institutional review board of the Chosun University. Data were collected anonymously. Informed consent in written or verbal form about the purpose and procedures of the study, estimated risks and benefits, privacy protection and confidentiality, as well as their right to freely withdraw from the study at any time was obtained from all participants. Verbal consent was obtained from some participants with confidentiality issues (e.g., some did not want to reveal their names with signatures in written form) after the principal investigator or research assistants explained the consent statement in the present of a witness, such as the researcher or other study participants.

: Not applicable.

: The author declares that she has no competing interests.

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