3.1  |  The search results
Preliminary search of the database obtained a total of 1,244 pieces of literature, after reading the literature and the title of a total of 1,186 pieces of literature screened out, the remaining 58 pieces of literature, by reading the full text of the final inclusion of six pieces of literature, including five pieces in English and one in Chinese, a total of 531 patients, the specific literature included in the flow chart is shown in Figure 1.