The monthly editorial by the co-editors in chief with each issue was instituted this journal at recommendation of Paul Glasziou, an board member, 1995. With a few exceptions where specific topic has been focus such as one on evidence arena [[1]Knottnerus J.A. Tugwell P. arena: multilevel playing field.J Clin Epidemiol. 2018; 102: v-viAbstract Full Text PDF PubMed Scopus (3) Google Scholar], for...