“…Generally, NCOI may be defined as a set of circumstances that creates a risk that the primary interest—the quality and integrity of the systematic review—will be unduly influenced by a secondary or competing interest that is not mainly financial [ 5 ]. Unfortunately, there are different opinions as to what constitutes a competing NCOI [ 3 ] and some authors have developed several critiques of the idea that journals should develop policies pertaining to NCOI since these policies will divert attention away from financial COI, or could cause confusion and undermine efforts to address COI and, most importantly, NCOIs are so poorly defined that COI policies are perceived as extremely difficult to implement [ 6 , 7 ]. All the following items could be potentially related to NCOI: institutional affiliations and/or academic associations, friendships and enmities, personal relationships, personal beliefs, type of training including professional or academic education, career advancement or promotion, a dominant researcher in an area of research, personal or even academic competition or rivalry, strong personal beliefs and participation in heated scientific debates, co-authoring publications with author(s) or being colleagues within the same section/department or similar organization unit in the recent years, supervising or having supervised the doctoral work of the author (s) or being supervised or having been supervised by the author(s), receiving professional or personal benefit resulting from the review, and having a personal relationship (e.g., family, close friend) with the author(s).…”