*4.2. Recommendation for Further Guidelines*

To overcome the limitations of our CPGs, a number of clinical studies are needed to accumulate evidence. In addition, to acquire data on stability and provide recommendations that can be realistically applied in the clinical field, it is necessary to expand the scope to case reports and observational studies while using RCTs as supporting literature in CPGs. A close review of more clinical experts is necessary to prevent the deterioration of quality.

**Supplementary Materials:** The following are available online at https://www.mdpi.com/article/ 10.3390/healthcare10020246/s1, Supplementary Materials S1–S5.

**Author Contributions:** Conceptualization, B.-K.S.; Funding acquisition: B.-K.S.; methodology: E.-J.K., H.-J.L., J.-S.K., D.N., T.-H.K., Y.-C.P., Y.-H.B., S.-S.N., M.S.L. and B.-K.S.; project administration: B.G., M.-g.J., E.-J.K., H.-J.L., J.-S.K., D.N., T.-H.K. and B.-K.S.; supervision: B.-K.S.; writing—original draft: B.G. and M.-g.J.; writing—review and editing: E.-J.K., H.-J.L., J.-S.K., D.N., J.W.K., T.-H.K., Y.-C.P., Y.-H.B., S.-S.N., M.S.L. and B.-K.S. All authors have read and agreed to the published version of the manuscript.

**Funding:** This research was funded by a grant of the Korea Health Technology R&D Project through the Korea Health Industry Development Institute (KHIDI), supported by the Ministry of Health & Welfare, Republic of Korea (grant number: HI20C1405, HB16C0061). Funding did not affect the content of the CPGs.

**Institutional Review Board Statement:** Not applicable.

**Informed Consent Statement:** Not applicable.

**Data Availability Statement:** All relevant data are included in this manuscript andSupplementary Materials.

**Conflicts of Interest:** The authors declare no conflict of interest.
