Moreover, to characterize all the selected studies; the data of study type, study location, study period, study settings, and participants' demographics including the percentage of male and female participants with the mean age in years, types of myocarditis, and the methods used for CRP detection were extracted from the selected studies. The quality of the selected studies was investigated by finding the answers to the quality-checking questions from NIH and UNC [31,32]. The gene discussed is CRP; the disease is myocarditis.