The references listed in this paper should be limited to the most important articles directly read by the author and published in official publications. Private correspondence and unpublished (including forthcoming) works and papers are generally not suitable as references. Reference should also pay attention to authority and timeliness. When the references are marked in this paper, they should be coded with Arabic numerals in the order in which the references appear, and the serial numbers should be placed in square brackets. According to the specific situation, it can be marked in one of the following three formats.

When the author's name of the original document has been indicated, the serial number shall be marked in the upper right corner of the author's name. For example, Vairaktaris and other studies show that the polymorphism of MMP-9- 1562C/T gene is closely related to oral cancer. When the author or the author of the original document is not indicated in the text, the serial number is marked at the end of the sentence of the quoted content. For example, ……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

When the text directly quotes the serial number of the document, it is regarded as a part of the sentence, and no corner code is marked. For example, the ultrasonic examination method of brachial artery can be found in the literature. The same reference in this paper has been cited many times, and the serial number is arranged only when it first appears (only once in the reference list), and the same serial number is used elsewhere; If the contents of different pages of the same reference are cited many times, the page numbers should be listed one by one in the reference list.