I am in the process of submitting a paper to a peer reviewed journal. The paper reports a study that was conducted 7 years ago. In the cover letter to editors that I have prepared, I point out that the topic remains timely, and I provide relevant references to illustrate this (which have also been used to update the paper). I feel that this information is sufficient at this time of initial submission, and that if the editors ask the reason for the delay in submitting the article, I can address it then. Any thoughts regarding this? Any suggestions for anything else to mention in the cover letter (aside from what normally goes in cover letters)?