Article History
Received: 16 June 2020
Accepted: 24 November 2020
First Online: 8 February 2021
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: Informed consent was obtained from all individuals included in the study conducted by Lee HB et al.
: All participants agreed with the informed consent regarding publishing their data.
: The study from which we obtained our data was approved by the hospital ethics review committee (IRB no.: BD-2010–083). Since this is a retrospective secondary analysis study, according to data protection guidelines, it is unnecessary to obtain formal ethical approval. We consulted extensively with the IRB in the first affiliated hospital of Guangzhou University of Chinese Medicine who determined that our study did not need ethical approval.