Let's end the old year and have a happy new year 2022 with Chiangrai Medical Journal Issue 13 Vol. 3 December 2021 During the situation of the Coronavirus Disease 2019, also known as COVID-19 that continues to protract and is facing a problem with the mutation of the deadly virus, COVID-19, which the World Health Organization named after the Greek alphabet "Omicron" but everything activities must continue.

 As for the contents of this Chiangrai Medical Journal, we would like to present 16 stories such as original articles, special articles, and case reports that are interesting and believed to be useful to readers and interested parties.

 Thank you to all authors who submitted articles and research for publication. Thank you to the experts for taking the time to evaluate the original article and thesis. To give ideas to improve the quality of work even better On the occasion of New Year's Eve and Happy Year of the Tiger, may everyone still maintain social distance. wear a mask received immunization vaccine prevent the occurrence of severe disease or Live disease life with NEW Normal happy healthy and safe from all strains of COVID-19