The Registry has a long track record in the publication of educational papers aimed at nephrologists with an interest in clinical research. Where it all started with a highly cited series ABC of Epidemiology in Kidney International in 2007 we are now working on our fifth series in Clinical Kidney Journal. Many nephrology journals followed and are now expanding the subject area to biostatistics and sometimes Machine Learning. A variety of other medical journals have provided interesting series of educational papers as well. A couple of those are also listed below. For easy-reference we have grouped all series by journal.