Received: 21 April 2020
Accepted: 23 July 2020
First Online: 3 August 2020
Ethics approval and consent to participate
: This is a prospective cohort study, and was conducted under the approval of Seoul Metropolotan Government-Seoul National University Boramae Medical Center Insituitional review board (SMG-SNU BMC IRB; IRB No. 20100729 / 06–2010-114/98). Patient’s informed consent was signed in a written format.
: A written format of informed consent, which includes information on the use, disclosure and publication of patient information on the condition of anonymity, was signed and obtained from all individual participants in the study.
: The authors declare that they have no competing interests.