High quality research is necessary to identify the diagnostic tests that are accurate and treatments that are effective. Systematic review of randomised controlled trials in literature is currently considered the best level of evidence in assessing whether a treatment is effective. Among systematic reviews, Cochrane systematic reviews are considered the best quality systematic reviews. Professor Gurusamy is the first author or contact author in more than 70 Cochrane systematic reviews and an author in more than 100 Cochrane systematic reviews. Overall, at least 40 of his systematic reviews and cost-effectiveness analyses have been used in national or international guidelines indicating that his research is not only of high quality, but also that the research topics he choose are important for patient management. A list of important national and international guidelines that have used his research to draw clinical guidelines are listed in https://sites.google.com/view/kgurusamy-guidelinescitations/home”.