If any from the sections are certainly not applicable to your manuscript, you should incorporate the heading and create 'Not applicable' for that area. But I also realize that there are conditions that warrant far more co-authors. The above mentioned standards although for co-authorship ought to usually be followed, and https://journalofmedicalcaserepor95949.anchor-blog.com/8001329/journal-of-clinical-case-reports-an-overview