The present editorial summarizes the last 2 calendar years of Advances in Clinical and Experimental Medicine (ACEM) publication (2021 and 2022). The specific aims were: 1) To clarify the classification of papers published in ACEM; 2) To present motivations behind choosing this classification; 3) To show how this classification is reflected in citations. Six categories of papers published in ACEM are presented: editorials, meta-analyses, reviews (including systematic reviews), multicenter studies, research-in-progress studies, and research letters; lack of clear definitions for editorials, research letters and research-in-progress studies is discussed. Thematic fields covered by all categories in 2021 and 2022 are presented and differences in this regard between 2021 and 2022 are highlighted. Reasons for not publishing case reports (CRs) are discussed, with some of the debate on this issue in medical literature summarized. The article type classification used in ACEM in only one of many possible solutions and may be modified in the future - it should be both clear for the authors and allow for orientation in the journal's content. The motivation for choosing the employed categories stem both from their position on the accepted levels of evidence in evidence-based medicine (EBM) and their potential to be cited.
Keywords: article type; case report; editorial; meta-analysis; research letter.