Since Tuesday, 5 May, 06:30 CET, we have been experiencing technical issues caused by high demand on our systems, which have significantly affected our journal libraries. To maintain platform stability and ensure continued access to critical services, all preprint and journal article PDFs were temporarily restricted, while HTML full-text content and XML files remained available. Since Thursday, 7 May, 08:30 CET, we have made the preprint PDFs available again; however, journal article PDFs remain restricted until the technical issues have been resolved. We apologize for the inconvenience and appreciate your patience as we work to restore full PDF access as quickly as possible. Thank you for your understanding.

The existing MS Word template for authors has been significantly expanded and now includes many important notes on the standard sections that must be included in the manuscript. Please visit the "Submission" page, section "Templates for your manuscript file" and download the new template before writing your next manuscript.

We are pleased to announce that a new referee application form is now available. This means that if you are interested in contributing to the peer-review process and supporting high-quality scientific publishing in your community then you can apply today to become a referee. Your expertise can make a difference. Visit the online form here to learn more and join our reviewer community.